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… may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. … may need three or four times your normal cardiac output, because your muscles need more oxygen when you exert yourself. …
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… affects smokers, how hard it is to stop smoking, what medicines are helpful, and what support is available in your … affects smokers, how hard it is to stop smoking, what medicines are helpful, and what support is available in your …
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