There is some evidence that who fathermen who smekersmoke in excess of 20 cigarekttescigarettes per day may increase the chanceschance of miscamiage beause hismiscarriage, because their sperm can be amage fromdamaged by smoking. alsoAlso, smoking can causes bronchitis, which leadleads to reduce a reduced ability to breathbreathe. passive smokingPassive (secondhand) smoke can also increase a non-smokersnon-smoker's risk of getting lung cancer, heart disease and asthma.