Consumption of e-cigarettes (particularly the famous "puffs") and other nicotine products has risen sharply among Swiss teenagers, and now exceeds consumption of traditional cigarettes. Yet these products are harmful to health. Nicotine is highly addictive for young people, and e-cigarette use causes significant respiratory morbidity for both active and passive users. We are just measuring the extent of the toxic effects of these products, given their recent appearance on the market, but the initial scientific evidence is extremely worrisome and calls for a rapid response. Prevention among young people is crucial, and better legislation is urgently needed.