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Yu X, Odenthal M, Fries JW

The increase has renewed concerns about the potential health effects of marijuana smoke, which is known to contain some of the same toxic combustion products found in tobacco smoke. The study, the statement said, found that exposure to acrolein, a chemical produced by the combustion of multiple materials, increases with tobacco smoking but not marijuana smoking and contributes to cardiovascular disease in tobacco smokers

This can be done before lighting, but also halfway through the session

As you can see below and at 2:56 in my video , about 30 to 40 percent of regular cannabis users suffer from cough, excess sputum, wheezing, and shortness of breath

Wounds may take longer to recover, and infections may last longer than they otherwise would

That is all you need to begin with