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Materials and methods Reagents and antibodies Research-grade 3R4F cigarettes were obtained from the University of Kentucky Tobacco Research and Development Center (Lexington, KY, USA)
Even when there are controls in place, the rules can be biased: in France, the national anti-smoking committee recently filed a complaint against producers accusing them of falsifying tests by placing micro-holes in filters so that the levels of substances they contained appeared lower when measured by the machine than they are when a smoker takes a drag on a cigarette while compressing the filter with their fingers this is one possibility, rightly noted by Roger Koch
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