UC San Diego Full article: Cognitive and Affective Responses to the U.S. FDA E Cigarette Addiction Warning and Advertisements among Young Adults in California: Product Design, Imagery, and Use UC Davis study reveals higher toxicity in disposable e cigarettes UC Davis study: Disposable vapes may be more toxic than cigarettes A new study from UC Davis found high levels of heavy metals in popular nicotine vapes adding to growing concerns about the real risks of vaping. Vaping puts stress on the cardiovascular E Cigarettes Circulation