Yes & maybe: Even just one cigarette a day can be harmful as it causes immediate decrease in blood flow. That doesn't consider all cancer causing stuff you inhale each day. Drinking once a week depends upon how much you drink. You can't average your alcohol. In other words, drinking nothing over work/study week so that you can drink 7 beers etc on friday isn't good for brain (study shows this shrinks brain).
Answered 9/1/2013
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