How Old Do You Have to Be to Vape? Complete Guide How Old Do You Have To Be To Buy Vapes in Ireland? How Old Do You Have To Be To Vape? 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. How Old Do You Have to be to Vape? Age Limits in Various Countries A 'historic victory,' say experts, as US raises age to buy tobacco, vaping products to 21 nationwide Fred Hutch