I wonder if we're going to start seeing effects of a lot of people increasingly smoking weed habitually, especially joints with no filtering. Certainly not as bad as cigarettes but it still can't be good for you to inhale hot smoke.
I wonder how many people want THC but never wanted to smoke in the first place?
And unlike tobacco, safer alternatives exist -- vaping doesn't require combustion, and edibles obviously carry no risk from inhalation.
Inhaling that amount of burnt stuff regardless of source is just not good for you.