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Canadian Medical Association Journal, Vol. 175, No. 3. (01 August 2006), pp. 255-261, doi:10.1503/cmaj.051235 Key: citeulike:11892291
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Background: The natural course of onset of cigarette use has been conceptualized as progressing sequentially through 5 stages (preparation, trying, irregular use, regular use, nicotine-dependent smoking). However, recent studies suggest that symptoms of nicotine dependence can occur early in the onset process, raising questions about the validity of this model. The objective of our study was to describe the sequence and timing of 12 milestones (6 related to cigarette use and 6 to symptoms of nicotine dependence) during onset of cigarette use.
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