So what’s in those e-cigarettes?

hm e-cigarettes _00002918.jpg

So what's in those e-cigarettes?

Its makers and users say the smoke-free alternative is better than tobacco, but what is in that vapor?

02:08 - Source: CNN

E-cigarettes 9 videos

hm e-cigarettes _00002918.jpg

So what's in those e-cigarettes?

02:08

Now playing

- Source: CNN

high school students vaping e-cigarettes gupta orig_00001716.jpg

Vaping an epidemic in US high schools

02:34

Now playing

- Source: CNN

e cig explodes 5

E-cigarette explodes in man's pocket

01:14

Now playing

- Source: WFIE

e-cigarette explodes in classmates face pkg_00000316.jpg

E-cigarette explodes, burns high school student

01:19

Now playing

- Source: WAFF

e-cig explosion flordia dnt _00011311.jpg

E-cigarette explodes in man's face, burns lungs

01:28

Now playing

- Source: WBBH

Smoking devices by the inventor of the electronic cigarette, Hon Lik are seen in Beiijng on May 25, 2009. Also known as an 'e-cigarette', the battery-powered devices are designed as an alternative to cigarettes, cigars and pipes, and provide inhaled doses of nicotine by delivering a vaporized propylene glycol/nicotine solution, while also providing the physical sensation and flavors similar to inhaled tobacco smoke. With 350 million tobacco smokers nationwide, China will join the world in observing World No Tobacco Day on May 31. AFP PHOTO/Frederic J. BROWN (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)

FDA to extend tobacco regulations to e-cigarettes

01:21

Now playing

- Source: CNN

E-vape battery explosion New Jersey PKG _00000618.jpg

Vaporizer battery explodes inside woman's purse

01:11

Now playing

- Source: News 12 New Jersey

hole ripped in vaping mans tongue pkg _00010811.jpg

Hole ripped in vaping man's tongue

01:28

Now playing

- Source: WTEN

"Tank" e-cigarettes are becoming increasingly popular. Heavily stylized and modifiable, they contain a larger cartridge of e-liquid and a battery pack that can be recharged, some by USB.

Spike in teen e-cigarettes use

02:20

Now playing

- Source: CNN