E-cigarettes: Helping smokers quit or fueling a new addiction?

Updated 12:52 PM ET, Thu May 5, 2016
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"Cigalike" e-cigarettes look like a traditional tobacco cigarette, with a light at the end that glows when the user draws on it. The battery-powered device heats "e-liquid," containing nicotine, which is released in aerosol form. Christopher Furlong/Getty Images
"Tank" e-cigarettes are heavily stylized and modifiable. They contain a larger cartridge of e-liquid and a battery pack that can be recharged, some by USB. Joe Raedle/Getty Images
"Electronic nicotine delivery systems" now take a variety of forms. E-hookahs have also been developed and have a strong cross-cultural market potential. Ethan Miller/Getty Images for Nightclub & Bar Media Group
A delegate at the "E-Cigarette Summit" smokes an e-cigar. In the e-liquid, nicotine is usually suspended in propylene glycol and glycerine. LEON NEAL/AFP/Getty Images
E-pipes work on the same principle. When someone draws on the device, it detects the air flow and heats the e-liquid in the cartridge to form a vapor. NICOLAS TUCAT/AFP/Getty Images
Vaporizers have also been adapted for marijuana. They have been developed for the medical market and contain cannabidiol (CBD), a method of pain-relief for glaucoma and migraines, while omitting THC, which causes the "high." ROBYN BECK/AFP/Getty Images
Nicotine gum and patches predate ENDS as a way for people to attempt to give up cigarettes. Joe Raedle/Getty Images