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Reducing smoking among people with mental illness is identified as the single most effective action for reducing the gap in life expectancy

Since temporal precedence is one of the necessary conditions for making causal inferences (i.e., a cause should temporally precede an effect) (Kenny, 1979), our longitudinal study design directly lends itself to inferring which mechanism (selection homophily or peer influence) is pre-dominant in the regression models examining lagged effects under objectives 1 and 2, and in the CLPMs examining reciprocal relationships between focal participant and friends variables under objective 3