There is some evidence that who fatherfathers who smekersmoke in excess of 20 cigarekttescigarettes per day may increase the chances of miscamiage beause hismiscarriage because their sperm may be amagedamaged from smoking. alsoAlso, smoking can causescause bronchitis, which leadleads to reducea reduction in the ability to breathbreathe. passivePassive smoking can increase a non-smokersnon-smoker's risk of getting lung cancer, heart disease and asthma.