Teens using e cigarettes show evidence of same toxic chemicals as smokers: Study ABC News E liquid guide : composition of an e liquid, flavours, PG VG, nicotine Le Petit Vapoteur E cigarettes and Youth: Vaping Myth! ~ Have you heard that e liquid is full of harmful chemicals? It's not true it's only got 4 ingredients. #vaping #vape #vapeuk #ecig #vapour 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.