Health | Well-being | Lifestyle on Instagram: "Cardiothoracic surgeon Dr. Jeremy London is sounding the alarm on vaping, and the risks are worse than most people think: 3 Reasons Vaping Is So Dangerous 1 Chemical Exposure - Vapes often contain toxic substances like formaldehyde and diacetyl, which can cause serious lung damage (like "popcorn lung"). 2 Nicotine Overload Most vape products contain unregulated levels of nicotine, raising your risk of high blood pressure, heart attacks, and stroke.