Mouth to Lung (MTL) Vs Direct Lung (DL) Inhale Explained E Cigarette Direct E Cigarette Exploded in a Teenager's Mouth, Damaging His Jaw The New York Times Tobacco and vaping don't just harm your lungsthey can stain your teeth, cause bad breath, lead to gum disease and even increase the risk of oral cancers and tooth loss. This # A few months of vaping puts healthy people on the brink of oral disease Vaping: The Health Risks and How to Quit HelpGuide.org