An updated overview of e cigarette impact on human health Respiratory Research Springer Nature Link Association of electronic cigarette use and risk of COPD: a systematic review and meta analysis npj Primary Care Respiratory Medicine Smoking vs Vaping Which is Worse? Smoking: 1. 7,000+ harmful chemicals 2. Causes lung cancer, COPD, heart blockages, strokes 3. Long term, progressive, and deadly Vaping: 1. Marketed as "safer" but misleading The impact of electronic cigarette use on chronic obstructive pulmonary disease: A systematic review and meta analysis ScienceDirect Does vaping cause lung cancer? UT MD Anderson