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
A global coalition of 500-plus scientists have formed the Global Consortium of Chemosensory Researchers, dedicated to open science, data sharing and interdisciplinary research to investigate the connection between the chemical senses and Covid-19
Consider bulk purchases: Buying cigarettes in larger quantities, such as cartons or packs, may provide cost savings compared to buying individual packs
The exact particulate exposure required to cause health issues isnt known, but studies in other occupations have shown that ultrafine particles cause cardiac toxicity