There are a few cannabis related ones, though activity is here or there on one or two. UK420, THCTalk, ICMag, GrowCity, etc.

I always thought the same, and I’ve been toking for about two decades. For pieces my friends and I always prefer glass. If using a glass piece though, it’s important to use vinegar once in a while (not just Isopropanol) to get rid of the chance of mould build up.

You know, I used to do this as a teenager, when cleaning my bearings with acetone, and I recall my family needing to get the sink repaired due to leakages getting quite severe at times.

Only through this post have I come to realise, 20 years later, that I was most likely at fault for the issue.
I mean I’m still not going to admit it to anyone, but it’s good to know and stuff.