People in North and South America have been smoking tobacco for millennia. The reason is simple. Tobacco contains nicotine, a highly addictive stimulant. So smoking tobacco feels good and is difficult to quit. After being introduced to Europe, smoking became very popular, because it feels good and is difficult to quit. It wasn’t until the 1950s that the association between smoking and lung cancer was confirmed. Electronic cigarettes (also called e-cigarettes, vape pens) in contrast, have ...