And the last I heard, oxygen was "combustible". Inhaling a combustible isn't a health risk; inhaling combustion products might be. But many pot smokers use a vape, set to well-below the combustion temperature for their chosen herb.
Vapes have issues too, which include exposure to heavy metals. By combustibles I mean anything you burn. Again, not a doctor and not a medical scientist so I may be using the wrong words but most people who use weed know these things. Most notably, anything that is smoked will incur a small but sharp rise in blood pressure. If you wear a heart monitor (or wrist watch with one) it's fairly trivial to detect.
And the last I heard, oxygen was "combustible". Inhaling a combustible isn't a health risk; inhaling combustion products might be. But many pot smokers use a vape, set to well-below the combustion temperature for their chosen herb.