Young People and Cigarettes Factsheet Legal Services Commission of SA For our undercover investigation, we sent under 18s onto the high street with hidden cameras. , Out of eight shops visited, five sold nicotine vapes to our underage secret shoppers. In several cases, How Old Do You Have to Be to Buy a Vape? All States How to Get a Vape Underage?Best Way to Buy, Borrow, or Find 1 KLOUDYX Can You Buy A Vape If Under 18 Online? People 18 years and older can now buy vapes with a nicotine concentration of 20 mg mL or less from participating pharmacies without a prescription, where state and territory laws allow. But they