How Old Do You Have to Be to Vape? How Old Do You Have to be to Vape? Minimum Legal Age? LOOKAH A 'historic victory,' say experts, as US raises age to buy tobacco, vaping products to 21 nationwide Fred Hutch Disposable Vapes and Underage Use: Laws, Data, Retailer Duties How Old Do You Have to Be to Vape? Complete Guide Did you know? The Tobacco 21 law raises the legal age to buy tobacco and vaping products from 18 to 21. Why? To help protect young people from a lifetime of addiction.