E cigarette advertising exposure among South African adults in 2017: findings from a nationally representative cross sectional survey BMJ Open Smoking or vaping: the revolution in tobacco and nicotine consumption Institut conomique Molinari New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking California snuffs out tobacco sales to teens, but some call new law unfair Daily News Analysis suggests e cigarette use may be linked to lower rates of smoking