if you stop smoking cigarettes will your lungs heal A cool guide on how long it takes for body to after quitting : r/coolguides What Happens When You Quit

Getting a puff or two into your chest can happen on occasion, but doing so deliberately and consistently will cause you to cough

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Moderate lifetime marijuana smoking associated with airway irritation but not lung function January 28, 2015 A research study based on analysis of publicly available data has found that recent marijuana use was associated with symptoms of airway inflammation, but that moderate lifetime use was not associated with clinically significant changes in measures of lung function

Nicotinic modulation of innate immune pathways via alpha7 nicotinic acetylcholine receptor