Nicotine is bad for the heart and possibly the brain. You're better off avoiding it. However, electronic cigarettes are better than smoking. The cancer and lung

Nicotine is bad for the heart and possibly the brain. You're better off avoiding it. However, electronic cigarettes are better than smoking. The cancer and lung damage come from inhaling particles. (In fact, it's not just tobacco; inhaling any particulate matter on a long-term basis is really bad. Tobacco's a common culprit because it's so ubiquitous; there aren't people smoking 30 pot or salvia cigarettes per day.)