The answer is whether you use tobacco. Drug or tobacco use isn't a protected category, so it's fair game for an employer to ask about.
Age, whether you have kids, and any disability you have are all protected categories — an employer isn't allowed to base a hiring decision on them, so those questions are off-limits in an interview. Drug and tobacco use sit outside that protection, and an employer can even make agreeing to a drug-testing policy a condition of getting hired.
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