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Not only did the study support earlier findings, but it suggests that "a single session of vaping can deliver more nicotine to the airways than smoking one cigarette." Moreover, the absorption into the bloodstream is lower, so the airways are exposed to these high nicotine levels for a longer period of time

While e-cigarettes generally contain fewer harmful substances than traditional cigarettes, the aerosol produced by e-cigarettes still contains several different harmful or potentially harmful substances, including: 7 Nicotine Ultrafine particles Diacetyl Volatile organic compounds Carcinogens Heavy metals such as nickel, tin, and lead Who Uses E-Cigarettes

Reynolds Premier a smokeless cigarette, which cost $300 million to develop and was pulled from the market in early 1989 after five months of testing

All other images are from the Walt Reed Illustration Archive