E-cigarettes are battery operated cartridges that contain vapour of nicotine without the tar found in tobacco. They are meant to replace tobacco as they were previously thought to be less harmful,

 

 However  a recent study by Harvard scientists have found about 75 percent of e-cigarettes to contain formaldehyde and flavouring chemical, Diacetyle, both of which cause cancer and the latter is also known to damage the lungs.

 

The World Health Organisation has always expressed concern about the safety of e-cigarette.

 

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