Question: A study is designed to compare e-cigarette users and non-users for risk of chronicbronchitis. Users are recruited from online vaping forums; non-users are recruited from

A study is designed to compare e-cigarette users and non-users for risk of chronicbronchitis. Users are recruited from online vaping forums; non-users are recruited from awellness centre in a nearby suburb. (3 points)(a) Is this a general or special exposure cohort and why? (1 pt)(b) How might this selection affect the exchangeability between groups? (2 pts)

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