We ignored the evidence linking cigarettes to cancer. Let's not do that with vaping Brendon Stiles and Steve Alperin The Guardian The rise of teen vaping is worrying doctors worldwide. While e cigarettes were once marketed as a safer alternative, research shows they contain nicotine, heavy metals, and cancer causing chemicals that can damage developing Frontiers Regulation of immune checkpoints by electronic cigarette Vaping and Lung Cancer Screening: Reduced Rates Among Vapers Revealed AJMC