E cigarettes may not contain tobacco, but they still deliver nicotine, a highly addictive substance that can harm the developing brain, increase blood pressure, and lead to long term addiction. Many also contain toxic Is an e cigarette a medical device? In England, that could soon be the case Symptoms like dizziness, nausea, and headaches after vaping aren't harmless. That is your body reacting to too much nicotinea serious warning that your body is being poisoned. Learn what's really happening and Infographic: E cigarettes & Cardiovascular Disease World Heart Federation