The Undying E Cigarette Controversy: Are They Safe to Smoke? DongA Science Don't Fall for the Safety Myth of Vaping & E Cigarettes e Cigarettes Safety Not Yet Proven CANSA The Cancer Association of South Africa CANSA The Cancer Association of South Africa E cigarette Characteristics, Safety Issues, & Regulation Britannica Vaping has become common, but it's important to know what you're inhaling. Many e cigarettes contain nicotine, heavy metals like nickel and lead, and chemicals that can harm your lungs and overall health.