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Another concern is that metal absorption is markedly higher through inhalation, as compared with ingestion, and that while some of the metals found in e-cigarette aerosol are essential elements when ingested (zinc, manganese, copper, and chromium[III]), exposure to these metals through inhalation tends to be toxic (Goyer and Lavoie, 2001
Cannabis is most commonly inhaled as smoke but is also available in other forms such as topical ointments, edible snacks, and concentrated oils that are used in vape pens