Electronic cigarettes

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Actually, it is possible that you may simply be exchanging one unhealthy habit for another:

The FDA’s Division of Pharmaceutical Analysis analyzed the ingredients in a small sample of cartridges from two leading brands of electronic cigarettes. In one sample, the FDA’s analyses detected diethylene glycol, a chemical used in antifreeze that is toxic to humans, and in several other samples, the FDA analyses detected carcinogens, including nitrosamines. These tests indicate that these products contained detectable levels of known carcinogens and toxic chemicals to which users could potentially be exposed.

FDA and Public Health Experts Warn About Electronic Cigarettes
Public Health Focus: Electronic Cigarettes
Health Canada Advises Canadians Not to Use Electronic Cigarettes