E Cigarettes and Lung Health American Lung Association Top 5 favorite pro vaping pro harm reduction studies. There are tens of thousands of them, but there are my five favorite most compelling studies done on the topic of nicotine vaping for tobacco The impact of electronic cigarette use on chronic obstructive pulmonary disease: A systematic review and meta analysis ScienceDirect Comparative study of lung toxicity of E cigarette ingredients to investigate E cigarette or vaping product associated lung injury ScienceDirect Secondhand Exposure to E Cigarettes Puts COPD Patients At Risk Respiratory Therapy The Impact of E Cigarettes and Asthma: What You Need to Know