Colonic Polyps The risk of developing colonic polyps is high in people with the smoking habit
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Statistical analysis We first applied Pearsons chi-square tests to test for the associations between parental smoking at Waves 1 and 2 and teenage substance use at 17/18 years, allowing us to compare departures from the expected distributions
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Firstly, exposure to caregivers who smoked was dichotomized (yes vs no) for each of the three caregiver smoking categories ( primary caregiver smoked , secondary caregiver smoked , and both caregivers smoked ) at Wave 1 and 2 and repeated for each teenage substance use variable at Wave 3 ( teenager ever-smoking , current smoking , ever e-cigarette use , ever alcohol use , current alcohol use , and ever use of other drugs )