Also not OP, but I can think of a number of reasons: 1. Awareness that alcoholism runs in the family, so better play it safe and not drink 2. Association betw

Also not OP, but I can think of a number of reasons: 1. Awareness that alcoholism runs in the family, so better play it safe and not drink 2. Association between alcohol and past trauma e.g. alcoholic abusive parent 3. Past relationship that ended due to ex-partner's alcohol problem 4. Religious conviction