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Hoffman, Fred (2014)

For example, propylene glycol (PG) is one of the primary constituents of e-cigarette aerosol and is generally recognized as safe when eaten but, when injected intravenously over a period of days, is toxic, they wrote

"Hookah smoking: Is it safer than cigarettes?"

Smoking cigarettes isnt a bad habit, its a serious and complicated addiction

The DSM-5: classification and criteria changes
