is smoking a cigarette once in awhile bad for you Why you? Everything You Need to Know

Vaping involves an e-cigarette that uses use a battery to heat up a special liquid (usually containing nicotine) into an aerosol that the user then inhales

Cotinine, the primary nicotine breakdown product, is commonly tested for in nicotine screening tests, along with other related substances, because it remains in the body longer than nicotine itself

In fact, one National Institutes of Health study found exhaled E-Cigarette aerosol to be composed of over 99.9% water and glycerine

PMID 2136102

American Public Health Association: e86-91

However, tobacco companies courtship of physicians did not end in medical journals