Nicotine is the addictive substance found in tobacco vegetation. Benzoic acid can be naturally found in plants, and is used commercially in dyes, perfumes, insect repellants, and meals preservatives. Existing cell, animal, and medical studies counsel that glycerin and propylene glycol irritate the lining of the lungs. One small scientific research from 2018 that found that the compounds modified vapers’ sputum—the mucosal lining that covers the internal respiratory tract—to specific completely 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 daily ideas that can assist you to reside your healthiest life.