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After one month, 39.2 percent of those who cut down gradually had not started smoking again, compared with 49 percent of the abrupt quitters

Participants We conducted a between-participant (or parallel-group) randomized clinical trial with adult smokers in North Carolina and California

Power calculations showed that to have 80% power to analyze the association between tobacco use and HPV infection with minimum effect size 0.5%, type I error 5% and the proportion of positive HPV in tobacco users was assumed 4%, and the ratio of non-users and users was 20, thus a minimum 11884 tobacco users and 237678 non-users were required