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Sixth, some confounding factors may not have been included in the analysis (residual confounding: the error or bias that remains in a studys results even after attempts have been made to control for confounding variables) and there is the possibility of a diagnostic bias on the part of the researchers who performed the smoking cessation measurements

Counties cringe at the thought they might have to help cover that cost, too

As this commentary has argued, the current restrictive regulatory environment has proven favourable to a large and growing black market resulting in a range of very serious negative outcomes

Sources [edit] Three Dog Nightmare: The Chuck Negron Story

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one in coloured bright red (representing people who smoked cigarettes daily) and nine are coloured pale grey and have a diagonal line through them indicating no smoking