Vaping propylene glycol and vegetable glycerine may lead to lung inflammation Think vaping is safer than smoking? While it may seem less harmful, vaping can still cause lung irritation, inflammation, and long term respiratory issues especially with regular use. The damage often starts Acute effects of cigarette smoke on inflammation and oxidative stress: a review Thorax Flavoring Agents in E cigarette Liquids: A Comprehensive Analysis of Multiple Health Risks Cureus