Surgeon General's Office considers cigarette smoking to America's worst drug addiction problem
Risk of bias assessment Only one study was classified as having low risk of bias 27 , while nearly all studies 23-26,28-33 (10 out of 11) were judged to have a high risk of bias or poor quality, primarily due to the domain of outcome measurement (Supplementary file Tables 6 and 7)
10 htroaryle, C 5
"They haven't been around long enough for us to have any calls about them," he said
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doi:10.3816/CLC.2004.n.016