Nicotine is the addictive substance present in tobacco plants. Benzoic acid can be naturally present in vegetation, and is used commercially in dyes, perfumes, insect repellants, and meals preservatives. Existing cell, animal, and clinical studies suggest that glycerin and propylene glycol irritate the lining of the lungs. One small scientific examine from 2018 that discovered that the compounds modified vapers’ sputum—the mucosal lining that covers the inner respiratory tract—to precise different immune proteins. Some of these protein modifications have been linked to asthma. Sign up for our Health Tip of the Day e-newsletter, and obtain day by day ideas that may assist you to reside your healthiest life.