There is unequivocal evidence that regular cannabis smoking causes acute lung inflammation, but what are the long-term consequences?
“There is unequivocal evidence that habitual or regular marijuana smoking is not harmless and causes respiratory symptoms and airway inflammation.” As you can see below and at 0:24 in my video Effects of Smoking Marijuana on the Lungs, if you take biopsies from the airways of those who smoke “cocaine, cannabis, and/or tobacco,” compared to nonsmokers, there is significantly more damage in the lungs of people who smoke, whether cocaine, marijuana, or tobacco. What’s more, the levels of damage seemed comparable, especially between the marijuana smokers and tobacco smokers. This is remarkable since the tobacco smokers were smoking about a pack a day, whereas the marijuana smokers were only smoking about 20 joints a week, rather than 25 cigarettes a day, and those smoking cocaine were just doing a gram or