cigarettes are a source of radiation exposure The presence radioactive polonium-210 and lead-210 in tobacco and Facts About Cigarette Smoking and

Although it is reasonable to assume that, if existing smokers switched completely from conventional cigarettes (with no other changes in use patterns) to e-cigarettes, there would be a lower disease burden caused by nicotine addiction, the evidence available at this time, although limited, points to high levels of dual use of e-cigarettes with conventional cigarettes, no proven cessation benefits, and rapidly increasing youth initiation with e-cigarettes

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A similar smell may come from an AC vent if a circuit board or fan motor in your air conditioner shorts out

If only getting rid of an addiction was so simple