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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
I'm Canadian and only smoke Canadian cigarettes, and when I run out of my brand I buy export A light blue from here
For example, the smell of smoke from cigarettes or in the aftermath of a fire
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