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
If we can stop prospective consumers at the marketing level, the trajectory of preventable disease and death associated with smoking may finally look much more hopeful.

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Top E-cigarette Brands in the World 2019 1