Backers say they hope the legislation will curb underage use of e-cigarettes, but critics say the ban will make it harder for adults to purchase an alternative to regular cigarettes.
San Francisco is a city that celebrates its marijuana culture, but it appears deeply opposed to other vices. Last year, voters approved a ban on the sale of flavored tobacco and in 2016, a tax on sugar-sweetened drinks.
E-cigarette maker Juul Labs, which is based in San Francisco, says it is opposed to youth vaping.
The company is working on a ballot initiative that would regulate but not ban e-cigarette sales.
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