I don't think there is anything to be concerned over no matter what is being said here. As far as ss being toxic I'm not sure we can achieve this state with our torches. I think the temp is much higher than we can produce. I misunderstood the op in the first place so beat a dead horse. I don't think being toxic was the issue here at all. I'm not sure what is produced from burning butane. All manufactures have different qualities and processes. I know there is paraffin wax in butane, they also have propane and other gasses so who knows the byproducts... All in all I know I feel better than when I smoked. I coughed up some nasty stuff the week after I quite, and seem to be breathing better and tasting food now. I don't feel so tired and sleep better now and have more stamina. I can't complain about vaping one bit 
