article_snippet.sent: E-cigarettes typically deliver nicotine, propylene glycol, glycerin and flavorings through inhaled vapor.
article_snippet.sent: E-cigarettes have been on sale in the United States since 2006, but this is the first year that the Centers for Disease Control has measured E-cigarettes use.
article_snippet.sent: There are currently more than 400 brands of 'e-cigs' available.
article_snippet.sent: E-cigs contain far fewer cancer-causing and other toxic substances than cigarettes, however cigarettes long-term effects on health and nicotine dependence are unknown.
article_snippet.sent: The popularity of e-cigarettes, which typically deliver nicotine, propylene glycol, glycerin and flavorings through inhaled vapor, has increased in the past five years. '
article_snippet.sent: Researchers have been critical of the fact that packaging and marketing of e-cigarettes is not regulated, and that manufacturers' opportunities to target adolescents are wide open, absent FDA regulation of these products.
article_snippet.sent: There are currently more than 400 brands of 'e-cigs' available in the US.
article_snippet.sent: E-cigs contain far fewer cancer-causing and other toxic substances than cigarettes, however cigarettes long-term effects on health and nicotine dependence are unknown.
highlights_snippet.sent: Experts warn e-cigarette marketing is not regulated .