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In the PSM data set, the number of smoking days in the first 30 days increased by 0.33 days to 1.64 days, depending on the end-use definition of Wave 2; these changes are not related to the end-use of Wave 2. Between wave 2 and wave 3, smoking intensity also increased in the first 30 days, especially in YAs that used cigarette butts for 6 days or more in the first 30 days; however, these estimates are consistent with those of wave 2. The person is not connected. Compared with those who have never used cigarette butts for 6 days or more in the past 30 days, the number of people who smoked in the past 30 days increased by 44.4, but this increase was not statistically significant.

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