Yes. Yes, smoke is a very potent irritant and any form of exposure will affect an infant. The infant will have exposure from smoke on clothing, hair, skin especially if the smoker is the care taker. This will predispose your infant to a variety of health issues including frequent upper respiratory problems, increase risk for asthma and progressive lung problems.
Yes. It is known to double or triple the respiratory infections in childhood.It also increases the risk of crib death in exposed infants. This has been the most studied air pollutant for decades and the results confirmed on multiple occasions.