SD units are sold as is
Teenage users of smokeless tobacco have a higher risk of becoming cigarette smokers within 4 years than non-users
Xu X, Tao Y, Niu Y, Wang Z, Zhang C, Yu Y
Thus, these individuals presumably would not have had any change in potential CO protection or ANA prevalence between Periods 1 and 2, since vaping did not begin until 2007, but would have had a decrease in potential CO protection and, consistent with our hypothesis, a corresponding increase in ANA prevalence between Periods 2 and 3, as some of them took up vaping
Working with other orders of governments, the medical community and other stakeholders, the government will do more to protect youth from the risks of vaping. These new regulations will prohibit the promotion and advertising of vaping products anywhere they can be seen or heard by youth as well as implement new mandatory health warnings on vaping product packaging