The hardware people use, discussed as objects: glass and its manufacture, filtration and how much of it does anything, grinders, papers and filters, storage that holds humidity, and how to keep any of it clean enough to be worth using.
Materials are most of the subject. Borosilicate glass, the difference between a thick piece and a durable one, ceramic and titanium where heat is involved, and the silicone and plastic that should not be in the heat path at all. Cleaning is the other half, since residue is both the main source of a bad taste and the main place contamination accumulates.
Two boundaries. This board is about equipment, not about consumption habits, promotion of recreational use, or anything aimed at countries where cannabis is prohibited. And nothing may be offered for sale here: the flower is a controlled herb under the Notification of the Ministry of Public Health Re: Controlled Herbs (Cannabis), B.E. 2568; advertising it is prohibited, and so is selling it online.
There are no reference articles in this sub-board yet; member questions and gear discussion are what it needs first.