Three medical traditions wrote cannabis into their books long before anyone isolated a cannabinoid — and reading those books as if they were clinical trials is the commonest mistake in cannabis writing.
1. Why This Is Not an Endorsement
Cannabis has a long documented presence in South Asian, Chinese and Southeast Asian medicine. That is history, not a medical argument. The usual case — centuries of use prove it works and is safe — fails on both halves: persistence is a fact about culture, not about pharmacology.
On sources: most history here rests on tertiary encyclopaedic summaries, and single-source details are marked reported, not independently verified here. On modern evidence the United States National Center for Complementary and Integrative Health and the United States National Cancer Institute outrank the encyclopaedia; where a traditional claim conflicts with them, the government source wins.
2. How Traditional Systems Reason
Ayurveda organises the body around three doshas — vata, pitta and kapha — health being balance among them and disease imbalance. Chinese medicine organises around yin and yang, qi, the five phases, and above all pattern discrimination, where the task is identifying a patient’s pattern rather than naming a disease. A substance earns its place by fitting the scheme and by generations reporting it seemed to help. That is how most useful plants were found, but it cannot distinguish a drug working from a patient recovering anyway.
The mainstream assessment is blunt: the encyclopaedic summary of Ayurveda calls its theory and practice pseudoscientific, and the summary of Chinese medicine says a large share of its claims are pseudoscientific and most treatments lack robust evidence, citing a 2007 assessment in Nature that most have no logical mechanism of action. A plant in a classical text is a lead, not a finding.
3. Ayurveda and the Plant Called Vijaya
Names and the Textual Record
Indian usage splits the plant into products: charas is the resin, ganja the flower, bhang the seeds and leaves. Ayurvedic literature also uses vijaya; tantric texts use samvid.
Charaka and Sushruta Samhita date roughly to the second to fifth centuries of the common era; the Atharvaveda, around 1500 to 1000 before the common era, lists bhang among five sacred plants said to relieve anxiety. But the Chikitsa-sara-sangraha of Vangasena, late eleventh century, is called the earliest surviving Indian text with an uncontested mention of cannabis, so earlier attributions are contested. Reported, not verified here.
What the Tradition Claimed
In what the tradition calls a proper quantity, bhang was believed to relieve fever, dysentery and sunstroke, clear phlegm, aid digestion, increase appetite, address speech imperfections and lisping, and give alertness; pain relief, aphrodisiac effect and sleep also recur. Every verb there belongs to the tradition; none states what cannabis does.
Preparation as a Harm-Reduction Practice
Bhang is worked into food, mixed with milk and filtered, made into sweets, or rolled into balls; preparation reportedly includes Sanskrit chants, and distribution is tied to Maha Shivaratri and Holi. Ritual standardises the procedure, and filtering plus a fixed food vehicle limits how much a person receives — harm reduction of a sort, not a measured dose. We could verify no formal purification protocol, though such protocols are claimed elsewhere.
4. Chinese Medicine and the Mistake Almost Everyone Makes
The Seed Is Not the Resin
Popular writing claims Chinese medicine used cannabis for two millennia, then illustrates it with a flower. The classical Chinese materia medica interest is overwhelmingly in the seed and the fibre plant. Shennong, the mythological Divine Farmer, is credited in legend with recording 365 medicinal herbs and with teaching the use of cannabis; the pharmacopoeia bearing his name was written down around 200 to 250 of the common era. That is a statement about the legend, not the materia medica.
Tao Hongjing’s Mingyi bielu, dated 456 to 536 of the common era, says hemp-seeds are very little used in medicine. Classical vocabulary names flower parts too — mafen, mahua, mabo — but our source glosses one of those same terms as hemp-seed in that passage and as a flower part elsewhere: the translation is unstable. Cannabis seed remains continuously listed in the Chinese Pharmacopoeia.
Why the Conflation Matters
Hemp seed is an oilseed — hulled seed is roughly 49 percent fat and 32 percent protein — not a source of meaningful tetrahydrocannabinol. Citing a seed entry as evidence that a tradition endorsed psychoactive cannabis is a category error, and the commonest error in this literature. We also decline to repeat the Chinese herb names for hemp seed common in English cannabis writing; we could not verify them.
5. Thai Traditional Medicine and the Leaf in the Kitchen
The System, Its Branches and the Leaf
Thai traditional medicine grew from indigenous animistic practice, absorbing Mon, Khmer and Tai material with Indian and Chinese knowledge. Its recognised branches are internal medicine using herbs and diet; external medicine including massage and bone-setting; spirit medicine including amulets and sak yan tattooing; divination; and a Buddhist mental-health branch. The Thai word for cannabis is kancha, written กัญชา.
Cannabis was used across Southeast Asia as a kitchen condiment, a medicine and a fibre source; two applications are specifically recorded, easing labour pains and use by labourers as a muscle relaxant. The claim that cannabis leaf was standard in certain Thai noodle broths is widely reported but we could not verify it. Lists of named traditional Thai formulas approved by the Ministry of Public Health circulate online; we verified none and therefore name none.
The Twentieth-Century Break and the Return
Thai traditional medicine was outlawed as quackery in the early 1900s in favour of Western medicine. Rehabilitation came late: a national plan covering 1992 to 1996 promoted integrating it into health services, and in 1993 the government founded the National Institute of Thai Traditional Medicine under the Ministry of Public Health.
6. The Three Systems Side by Side
| Feature | Ayurveda | Chinese medicine | Thai traditional medicine |
|---|---|---|---|
| Explanatory scheme | Three doshas | Yin and yang, qi, five phases, pattern discrimination | Animistic base, Indian and Chinese layers |
| Plant part of interest | Leaf and seed as bhang; resin and flower named separately | Seed and fibre; flower parts marginal | Leaf |
| Earliest verifiable reference | Late eleventh century, uncontested | A record of 456 to 536 of the common era | None verified here |
| Typical route | Oral, in food or drink | Oral; seed as food and pharmacopoeia item | Culinary or oral |
| Legal role today | Bhang partly outside narcotics control | Practitioners are prescribers in Thailand | Central to the cannabis framework |
7. Named Preparations and Their Forms
| Preparation | Tradition | Material | Form |
|---|---|---|---|
| Bhang | Indian | Leaves and seeds | Paste worked into food |
| Bhang lassi and thandai | Indian | Leaves and seeds | Milk drinks, filtered |
| Bhang goli and halva | Indian | Leaves and seeds | Ball or tablet; sweet |
| Ganja and charas | Indian | Flower; resin | Named product categories |
| Cannabis seed | Chinese | Seed | Pharmacopoeia item, oilseed |
| Kancha leaf | Thai | Leaf | Culinary ingredient |
No quantities, methods or dosing appear anywhere in this article, deliberately.
8. The Structural Point That Changes Everything
Low Potency Swallowed Versus High Potency Inhaled
Almost every traditional preparation above shares three properties: whole plant rather than extract, low potency, and oral use inside food, meaning slow onset and heavy first-pass processing. Modern products invert all three. Cultivars grown for effect run from about 2 percent to over 20 percent tetrahydrocannabinol against the roughly 0.3 percent ceiling defining industrial hemp, extraction concentrates further, and the dominant routes today are inhalation and concentrates.
Why the Old Safety Record Does Not Transfer
A tradition’s safety record is a record of one material used one way. Change potency by an order of magnitude and change the route, and you are not testing the same intervention. Extraction also concentrates whatever else was on the plant, since many pesticides are lipophilic and dissolve into the same solvents. A 2020 Frontiers in Pharmacology review by Montoya and colleagues cites research indicating 69 percent of cultivation pesticides survive into smoking, and that mercury is absorbed about ten times more efficiently by the lungs than the gut.
9. Traditional Claims Against Modern Evidence
Where tradition and the two government health bodies disagree, the government position governs.
| Traditional claim | Tradition | Current evidence position |
|---|---|---|
| Increases appetite | Indian | Partial overlap. A synthetic tetrahydrocannabinol is approved for appetite loss in human immunodeficiency virus |
| Relieves nausea and vomiting | Not a headline classical claim | Closest to supported. Cannabinoids beat placebo and matched other medicines for chemotherapy-induced nausea |
| Relieves pain | Indian; Thai muscle-relaxant use | Weak. A 2018 review found a small benefit: 29 percent of users reached 30 percent pain reduction against 26 percent on placebo |
| Relieves anxiety; aids sleep | Atharvaveda; Indian sleeping aid | Thin. A little evidence suggests cannabinoids might ease anxiety; better sleep is reported but may not be caused by cannabis |
| Treats diarrhoea and dysentery | Sushruta, Sarngadhara | Conflict. No difference from placebo for remission in inflammatory bowel disease; unknown for irritable bowel syndrome |
| Fever, sunstroke, phlegm, speech defects, aphrodisiac | Indian | No modern evidence base exists |
| Eases labour pains | Thai | No support; pregnancy use carries recognised risk, including lower birth weight after smoking |
| Treats or cures cancer | Modern folk claim | Rejected. The United States Food and Drug Administration has not approved cannabis for cancer or any condition; anti-tumour findings are laboratory only |
Overlap, Conflict and Silence
The overlap is narrow and symptomatic: nausea, appetite, weakly pain. The strongest modern result — a purified cannabidiol medicine approved for seizures associated with two epileptic encephalopathies — matches nothing in the traditional record. The traditions did not find the best-evidenced use. The clearest conflict is gastrointestinal, and cannabinoid hyperemesis syndrome, in which some long-term high-dose users develop recurrent severe vomiting, cuts against the anti-nausea reputation. Elsewhere nobody ran the studies — silence is not refutation, but it is not permission either.
10. The Thai Revival and a Genuinely Unusual Legal Arrangement
From Prohibition to Delisting and Back
Thailand criminalised cannabis under the Cannabis Act of 2477 in the Buddhist era, 1935, reinforced by the Narcotics Act of 2522, 1979. In 2018 it became the first Asian country to legalise medical cannabis. In June 2022 cannabis flower left the narcotics list and roughly 4,200 prisoners were released. By 2025 over 11,200 dispensaries were approved.
The Ministry of Public Health’s Notification of the Ministry of Public Health Re: Controlled Herbs (Cannabis), B.E. 2568 effective 26 June 2025, reclassified cannabis flower as a controlled herb restricted to medical use. Prescriptions must use the official paper form, cannot be issued online, must specify product type, dosage and duration, cannot exceed 30 days, and are single-use; sellers may supply only against one, inspectable by the Department of Thai Traditional and Alternative Medicine or the police.
Why This Arrangement Is Unusual
Seven categories of practitioner may prescribe: medical doctors, Thai traditional medicine doctors, applied Thai traditional medicine doctors, folk healers, Chinese medicine practitioners, pharmacists and dentists.
Read that list again. Most jurisdictions route medical cannabis exclusively through conventional physicians; Thailand administers it through a traditional-medicine department, with folk healers as legal prescribers, in the very system outlawed as quackery a century earlier. That cuts both ways: it supplied a licensed workforce and a legitimacy a pharmaceutical framing would have lacked, and prescribing authority now rests partly with practitioners whose reasoning is not evidence-based. This is a legal fact about who may prescribe, not a claim about who is right.
11. Safety in Practice
Unstandardised Material and Contamination
Traditional preparations have no defined content; neither, often, do modern ones: 69 percent of 84 cannabidiol products from 31 online retailers were inaccurately labelled. Health authorities warn that such products may contain more or less than stated and may carry contaminants including tetrahydrocannabinol.
The Frontiers review documents pesticide residues in most sampled material; heavy metals, because the plant hyperaccumulates cadmium, lead and mercury, which is why it is used for soil remediation; and fungal and bacterial contamination including Aspergillus and Fusarium species, dangerous chiefly to immunocompromised people — those most likely to be reaching for a medical product. Not unique to cannabis: a 2008 study found roughly 20 percent of Ayurvedic remedies examined contained lead, mercury or arsenic.
Interactions and Population Risk
Cannabidiol has been associated with drug interactions. The health authority also notes increased motor vehicle crash risk, lower birth weight after smoking during pregnancy, higher risk of schizophrenia and other psychoses with frequent use, and cannabis use disorder, with adolescents four to seven times likelier than adults to develop it. Adulteration of traditional remedies with undisclosed pharmaceuticals is documented too: many so-called natural remedies work because they contain hidden conventional drugs.
12. What Responsible Curiosity Looks Like
Ask what a text says, when it was written, and whether the attribution is contested. Notice when a claim rests on one encyclopaedia entry, or when a Sanskrit, Chinese or Thai term is used loosely in translation. Traditional systems generate hypotheses; trials test them. When the two disagree, the health authority is the better guide to what will happen in your body, and saying so is not disrespect for the tradition.
Work with a licensed practitioner — in Thailand that may legitimately be a traditional practitioner under the 2025 framework. Disclose everything you take. Prefer tested, certified material, and be sceptical of labels. Treat any claim that cannabis treats or cures a disease as a red flag about the source.
Now over to you: what do practitioners in your country actually do? In India, is bhang medicine, festival custom, or both, and does anyone still invoke the classical texts? In China, do practitioners you know use the seed? In Thailand, has anyone been prescribed by a traditional medicine doctor or a folk healer under the 2025 rules, and what did that consultation look like? And if you can source a named traditional formula we declined to repeat, post it — we would rather be corrected than repeat folklore.
This article is part of the Asiannabis Community educational series on medical cannabis. It is general information, not medical advice — treatment decisions belong with a licensed practitioner. Content is for educational purposes within jurisdictions where medical cannabis is legally permitted.