cigarette #lifeexpectancy Professor Erwin Loh 13 comments How Do Electronic Cigarettes Work? UPMC HealthBeat Resources for Professionals About Vaping & E Cigarettes: A Toolkit for Working with Youth Why Youth Vape Smoking and Tobacco Use CDC Conclusions about the effects of electronic cigarettes remain the same Cochrane Introduction, Conclusions, and Historical Background Relative to E Cigarettes E Cigarette Use Among Youth and Young Adults NCBI Bookshelf