It's easy enough to buy a smoke at Isa Yakubu's grocery store on a busy street in Lagos, Nigeria. Never mind if you don't have much money. Most local merchants are happy to break open a pack and sell cigarettes one at a time — single sticks, as they're known — for about 10 Nigerian naira, or 7 cents. "St. Moritz is the most popular brand," says Yakubu. "But [people] also like Rothmans and Benson & Hedges."

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