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The researchers say they cant prove smoking caused the gene expression variations, or that these variations cause cannabis, alcohol or tobacco use in later life

McGraw Hill / Medical.

The interviews included questions on various demographic parameters including age, gender, and a questionnaire of interests such as duration of recurrent sore throat problems, number of episodes of recurrent sore throat in a year, history of secondhand cigarette smoking, number of hours of daily exposure to secondhand cigarette smoke, number of years of exposure to secondhand cigarette smoke, exposure to several cigarettes per day in the home, and exposure to secondhand smoke in public places and at school every week

April 2, 1993 press release by Philip Morris Companies Inc