news.psu.edu/story/337639/2014/12/09/research/e-cigarettes-less-addictive-cigarettes
HERSHEY, Pa. -- E-cigarettes appear to be less addictive than cigarettes for former smokers and this could help improve understanding of how various nicotine delivery devices lead to dependence, according to researchers.
"We found that e-cigarettes appear to be less addictive than tobacco cigarettes in a large sample of long-term users," said Jonathan Foulds, professor of public health sciences and psychiatry, Penn State College of Medicine.
The popularity of e-cigarettes, which typically deliver nicotine, propylene glycol, glycerin and flavorings through inhaled vapor, has increased in the