Nicotine is the addictive substance found in tobacco vegetation. Benzoic acid is also naturally found in crops, and is used commercially in dyes, perfumes, insect repellants, and meals preservatives. Existing cell, animal, and clinical studies recommend that glycerin and propylene glycol irritate the lining of the lungs. One small clinical study from 2018 that found that the compounds modified vapers’ sputum—the mucosal lining that covers the interior respiratory tract—to specific different immune proteins. Some of these protein changes have been linked to asthma. Sign up for our Health Tip of the Day newsletter, and obtain every day suggestions that may help you reside your healthiest life.

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