I would agree, besides, IF joints caused that much damage there should be overwhelming evidence of that in lung cancer statistics. I knew enough people who smoked pot like fiends in high school, college and afterwards...you’d think they’d be dropping like flies, but they aren’t.
Not everyone who smokes cigarettes gets lung cancer either.
If you could find enough people who smoked only pot like cigarettes for the number of years that people smoke cigarettes before they get lung cancer, then that might be a valid comparison.
Problem is, the results are likely to be skewed because of the number of people who smoke pot AND cigarettes; and finding ONLY pot smokers who smoke that heavily is probably going to be difficult.