That provision, part of a $1.4 trillion spending bill which President Donald Trump signed into law on Friday, would apply not only to traditional tobacco products such as cigarettes and cigars, but also to e-cigarettes—products that have lately been caught in regulatory cross-hairs, sparked by rising rates of use among teenagers. According to the latest federal data, 27.5% of high school students reported using e-cigarettes during the past month. Raising the legal age of purchase is meant in part to curb that trend by preventing teenagers from buying vaping products, either for personal use or to distribute to younger classmates. So-called “Tobacco 21” legislation has already been implemented in almost 20 states as well as numerous cities across the country. The new legislation, which will take effect in the summer of 2020, would make 21 the mandatory minimum age of purchase for all states.