Second, we estimated multivariable linear regression models of cigarettes smoked per day, conditional on the frequency of vaping (categorized as every-day, some-days, ever but no longer, never), psychological distress (categorized as NPD, MPD, and SPD), the interaction of vaping and psychological distress (these variables were demeaned, or centered so that main effect coefficients could be directly interpreted 26 ), and other covariates described above
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Impact of smoking abstinence on working memory neurocircuitry in adolescent daily tobacco smokers
Consistent smoking experience: Premium tobacco delivers reliable flavour from start to finish
The use of mind-altering substances by humans is age-old, but we have entered a new era