I'm quite sure breathing in any sort of hot soot does you no favors, but it's obviously absurdly false that the chemical composition of the smoke doesn't matter, or that all smoke is made equal. Some smokes are much worse than others.
American Sprits initially made it seem like their additive free cigarettes were somehow more "healthier" when they really weren't. I get that chemically they aren't the same thing. However it's like saying Captain Morgan isn't as bad as Fleischmans. If you compare someone taking significantly more weed hits than you are tobacco hits, the weed smoker will most likely be in poorer health than the tobacco smoker.
