It's not just the rules themselves that are complicated
Impact of smoking abstinence on working memory neurocircuitry in adolescent daily tobacco smokers
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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
Just entrance into the void