After San Francisco banned adults from purchasing flavored tobacco and vaping products in 2018, a funny thing happened. Teen smoking rates increased.

Now, two other major California cities are considering similar bans. Like San Francisco's, the proposed measures in Los Angeles and San Jose are backed by vocal advocates who argue that candy- and fruit-flavored electronic cigarettes and tobacco products (which minors are already prohibited from legally purchasing) are tempting kids to get addicted to nicotine. [...]