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SA members were expected to smoke only SA brands

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While participants rated the (very low-nicotine cigarettes) as less rewarding than their usual cigarettes, they also believed (they) would be less harmful to their health

We conducted an a priori power analysis using G*Power Software for independent samples Students t-test 22 , assuming the group difference in mean change of the score is 2 (standard deviation 1.3) 7 and aiming to detect a significance level of 1% and statistical power of 90%, a total sample size of 30 participants (15 in each group) was needed