The HEPA filter itself also rotates inside the cylindrical purifier for 360-degree filtration
Death on Drugs Death on Drugs playing cards, United States, 1985
doi: 10.1016/j.autneu.2006.03.007
"An Analysis of Tobacco Industry Marketing to Lesbian, Gay, Bisexual, and Transgender (LGBT) Populations: Strategies for Mainstream Tobacco Control and Prevention"
Participants will be classified as abstinent if they respond no to both of the following questions: (i) have you smoked any cigarettes (even a puff) in the last 7 days? and (ii) Have you used any tobacco product (i.e., chew, snuff, pipe, cigar, etc.) in the last 7 days? Self-report will be biochemically confirmed with expired CO at each in-person visit and urinary anabasine at week 13
In line with this stringent approach, Mexico had previously instituted a ban on the importation of e-cigarettes