In all clinical studies, abstinence from smoking was determined by patient self-report and verified by measurement of exhaled carbon monoxide (CO 10 ppm) at weekly visits
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The CDCs Office on Smoking and Health provides millions of dollars to state health departments each year more than $84 million last year alone to staff their own quit lines and other tobacco control measures like medications to help smokers quit
Li G, Wang H, Wang K, Wang W, Dong F, Qian Y, Gong H, Xu G, Li Y, Pan L, et al