There are three likely contributing reasons for changing RRs over time: 1) the changing intensity of smoking over time, 2) decreasing mortality rates in never-smokers and 3) the time-lag from smoking to peak mortality harm
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ART MEASUREMENTS REFLECT OVERALL SIZE OF THE PIECE INCLUDING THE FRAME UNLESS OTHERWISE NOTED
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Atlanta, GA: US Dept of Health and Human Services, Centers for Disease Control and Prevention, National Center for Chronic Disease Prevention and Health Promotion, Office on Smoking and Health
Limitations We conducted likely the largest US study testing the association between various spliff usage behaviours and having the first joint within an hour after waking