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About a year https://tikabanget.com/stmap_41cdpun.html?cialis.amitriptyline.medroxyprogesterone cronosmed.com The study involved more than 1,300 young people aged between 10 and 15. All were non-smokers at the start of the study and their exposure to tobacco ads and subsequent smoking behaviour were then monitored for two-and-a-half years.