Health effects of electronic cigarettes Wikipedia While e cigarettes, or vapes, may contain fewer chemicals than regular cigarettes, they are still NOT safe. E cigarettes contain harmful chemicals. 99% of e cigarettes contain nicotine, making them highly addictive. Visit https: t.co 1y8cZxtgFQ to The impact of e cigarettes versus traditional cigarettes on long term cardiopulmonary outcomes American Journal of Physiology Heart and Circulatory Physiology American Physiological Society Does vaping (using e cigarettes) make a difference to our health and are there harms with second hand vaping? iHealth Facts