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CannaMD has reported on the question Does Smoking Marijuana Cause Lung Cancer? Key points of that reporting include: A large-scale study by Kaiser Permanente concluded that marijuana use was not associated with tobacco-related cancers or lung cancers

It found that the health benefits of stopping smoking begin immediately and grow over time

Some of these have been found to contain terrifyingly high levels of toxic metals

As breast cancer is the most commonly occurring cancer for women, and is attributable to alcohol and not smoking, a gender gap in smoking-related absolute cancer risk can be seen in alcohol abstainers, which widens with increasing levels of tobacco exposure (Fig