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����1.Firstofall,itmakestheheartbeatfasterandincreasesthebloodpressure.Thecigarettesmokealsoreducestheamountofoxygenintheblood.Consequently,thehearthastoworkharder,withlessoxygen.Finally,yourarterieswillnarrowfasterifyousmoke.
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����5.smokingisgoodforourhealth.
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����allow;dangerous;busy;careful;slowly
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