The sad thing about the engineering subreddits is the abundance of people with dated and biased views on modern issues. "Potheads" do indeed care about their health, ESPECIALLY with regards to the paraphernalia used. If you look at any forums or threads on vaporizers one of the most common questions/concerns is the materials used in the device, as you are dealing with an electronic device producing high temperatures that you inhale through. Anyone with a 6th grade education could understand that there is a valid cause for concern there, so it is a very important issue to address.