You'll have to be 21 to buy cigarettes or vape products in Washington starting Jan. 1, 2020 KNKX Public Radio Say no to vaping. 10 15 vape puffs are roughly equivalent to one cigarette. We want to encourage and support families to have open and engaging conversations with young people to How Old Do You Have to be to Vape? Age Limits in Various Countries Vape Age Laws: Minimum Age to Buy Vapes in the U.S. & Online Vaping and Oral Health: Can Dentists Tell You Vape?