Epigenetic and long term effects of nicotine on biology, behavior, and health ScienceDirect Vaping is NOT Harmless. Know the long term effects before it's too late! Most e cigarette liquids contain high levels of nicotine, which is highly addictive. Despite the legal age being 21, vaping devices Does vaping (using e cigarettes) make a difference to our health and are there harms with second hand vaping? iHealth Facts Vaping isn't harmless. While e cigarettes don't contain tobacco, nicotine is highly addictive and can harm brain development. E cigarettes can cause EVALIa serious lung injury linked to vaping. Symptoms like cough, chest