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Lifestyle refers to the way a person lives :) 
when a person is living with cigarettes,., the function of respiratory could be affected by having an abnormality regarding the heart beat of a person ,., :) as far as I know ., as a person puffs a cigarette ., it  increases the heart beat which can also lead to heart attack - circulatory system 
smoking can also lead to lung disease or the cause of lung cancer :) :D

hope it helps :)

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