Study: “Vaporization as a Method of Cannabinoid Administration” Published in: Journal of Psychopharmacological Drugs / Clinical Pharmacology & Therapeutics.
This is the "gold standard" study for your business. Researchers compared the smoke from burned cannabis versus the vapor from a device. The result showed that vapor consists almost exclusively of cannabinoids (95%), while smoke contains over 100 toxins and carcinogens.
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What the science says: By avoiding combustion, by-products such as carbon monoxide and tar are eliminated, protecting the respiratory system.
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Link to study: PubMed - Cannabinoid Vaporization