US raises legal age to buy cigarettes, vapes to 21 : r business How Old Do You Have to be to Vape? Age Limits in Various Countries A federal law changed the age requirement to buy tobacco products to 21, Wisconsin's state law still sits at 18. 8 in 10 Support raising the minimum age to purchase tobacco products, e cigarettes, and vaping devices to 21 Tobacco 21 Where do those underage get tobacco and vapor products?