legality of tobacco 13. Use, Policy, & Law Purchasing and consuming tobacco |

If there was any disagreement among authors regarding inclusion of an article, the senior author (D.C.F.) made the final decision on article inclusion

Characterization of electronic cigarette aerosol and its induction of oxidative stress response in oral keratinocytes

chords may be indicated above the notes

Because the outcome variable and the first mediator were dichotomous, and the focal predictor was an ordinal categorical measure, the mediation model was estimated in Mplus 8.3 using weighted least squares mean and variance adjusted (WLSMV) estimation with a probit link for endogenous categorical variables 23