Electronic cigarettes do n't use tar , other chemicals ; only liquid nicotine . Sales of e-cigs have been on the rise in the United Kingdom , Switzerland , Sweden and Brazil for several years . CEO ` ` pretty sure '' e - cigarettes are safe . FDA says safety not health , has been doing testing . WHO called for more safety tests in 2008 .
Electronic cigarettes do n't use tar , other chemicals ; only liquid nicotine . CEO ` ` pretty sure '' e - cigarettes are safe . FDA says safety not health , has been doing testing . WHO called for more safety tests in 2008 .