I noticed there didn't happen to be an ongoing thread about this so I figured I'd start one as there are a number of things you should never smoke out of that I hear people using all the time. Raise your hand if you're interested in toxins, nerve-damage, lung damage, metal poisoning or any other lovely affliction! Yeah.. I thought so hehehehe Things that are OK to smoke from... When all possible, smoke from glass. It's the most inert material you can use that won't add anything at all to your smoke. Bud smoked from glass also passes on all the flavor. (Disgusting if you're smoking brickweed. Heh) Clean Brass (Should be medical grade brass but usually never is) The brass pipe is one of the least harmful ways to smoke as long as the brass is clean of any oxidation and not too impure. A layer of resin helps stop the metallic taste and probably cut down on the amount of impurities that get vaped at low temps. Paper I've smoked joints for years. Lately I can't hack the paper and blunt papers just make the roach taste like so much hashed over Sh*t! Makes me hack just thinking about it. (Please don't taint good MJ with tobac. Unless it's brickweed I consider it a sin of sorts) Don't Know about these.... Titanium? Ok.. this one I don't know about. As far as I know Titanium is one of the lightest and most heat resistant materials commonly used in the space industry. I've seen a few items crafted with tta lately and I've been curious if anyone knows the toxicity or lack of for this metal? Ceramics? Another highly heat resistant material that is also inert when made with no impurities. How likely is that? Things not to smoke from... NO PLASTIC Plastic bongs are barely acceptable in my book. If they have a plastic bowl, skip it and you'll thank yourself. Don't even think about scraping resin from plastic either. *Gack!* Highly toxic even in small amounts. NO COPPER! EVER! Heated copper out-gasses some seriously bad fumes. Highly toxic with additional dangers, depending on where it came from. It's all bad so stay away! NO ALUMINUM! Yes, I too have smoked from a can in a pinch and dabbled with foil pipes as a kid. I seriously don't recommend them as you're inhaling vaporized aluminum and, again, whatever impurities are in it from wherever it came from. Don't use the aluminum one-hitters, bowls or anything aluminum and unless you have hundreds of thousands of dollars in equipment to remove all the "Bic Lighter" vaporizeable material from a homemade tinfoil screen.... try to avoid them(of course with that kind of cash you could just have a few screens from the local headshop 'Coptered' in for ya) NO NICKEL That includes those cheapo nickel plated bowls you buy for brass pipes. Why no nickel? Look at where it comes from and see what impurities are in it. Nickel crap is mass produced at low cost without any restrictions on impurities at all. They're sold as NOVELTY items. NO STAINLESS STEEL I don't recommend it. Can anyone come up with any better reasons? I'd post them here for sure. Feel free to chime in and give specifics as to why these are. Anything to stop people without the correct information poisoning themselves slowly (or quickly) using the wrong materials to smoke from. Did I miss any? GROW ON!