Study: Low-nicotine cigarettes curb use

This Thursday, Sept. 17, 2015 file photo shows an ashtray with cigarette butts outside the Oklahoma County Courthouse in Oklahoma City. Researchers found that smokers who switched to special low-nicotine ones wound up smoking less and were more likely to try to quit, according to a new study published in the New England Journal of Medicine on Wednesday, Sept. 30, 2015. (AP Photo/Sue Ogrocki)

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