The ban, which would be the first of its kind in the U.S., is aimed at discouraging young people from smoking.

Keeping cigarettes under wraps could help, anti-smoking advocates say, citing studies that link exposure to smoking with starting it. Shops from corner stores to supermarkets would have to keep tobacco products in cabinets, drawers, under the counter, behind a curtain or in other concealed spots. Officials also want to stop shops from taking cigarette coupons and honoring discounts, and are proposing a minimum price for cigarettes, though it's below what the going rate is in much of the city now.

While some of the research focuses on cigarette advertising, an English study of 11-to-15-year-olds published last month in the journal Tobacco Control found that simply noticing tobacco products on display every time a youth visited a shop raised the odds he or she would at least try smoking by threefold, compared to peers who never noticed the products.