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Even so, we have to take seriously the health danger of heavy tobacco consumption that modern medicine has established

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Overall, the evidence synthesized in this review indicates that dual use represents a critical challenge for tobacco control, as it appears to sustain nicotine dependence and expose users to compounded toxic effects

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AIM :To study the effects of smoking on the human respiratory system MATERIALS : Cigarettes, white cotton wool, hydrogen carbonate indicator APPARATUS : U-Shaped tube, filter pump, test tube, rubber stopper, retort stand and clamp, rubber connecters, thermometer PROCEDURE 1