How Old Do You Have to Be to Buy Cigarettes in the US? How old do you have to be to vape? Just a reminder, the minimum age to buy nicotine products in Indiana is 21. This means retailers are prohibited from selling cigarettes, e liquids, and e cigarettes to anyone under age 21. We How Old Do You Have to Be to Vape? Age Requirements for Buying Vapes: What You Need to Know Clutch Vape How Old Do You Need to Be to Vape?