Nicotine is the addictive substance present in tobacco crops. Benzoic acid can be naturally found in crops, and is used commercially in dyes, perfumes, insect repellants, and meals preservatives. Existing cell, animal, and medical research counsel that glycerin and propylene glycol irritate the liner of the lungs. One small scientific research from 2018 that found that the compounds changed vapers’ sputum—the mucosal lining that covers the interior respiratory tract—to precise totally different immune proteins. Some of these protein changes have been linked to asthma. Sign up for our Health Tip of the Day e-newsletter, and obtain every day ideas that can assist you to reside your healthiest life.