How can i protect my baby from second-hand smoke if someone at home is a smoker?

Quit or go outside: The best way to avoid smoke is not to have it around at all. Talk to the family member who is smoking and encourage them to quit. However, in the meantime to protect yourself and your baby by asking the person to always smoke outside and change their clothes before coming inside and coming in contact with your baby.

Move/Smoker goes out: Smoking anywhere in a home gets to everyone in the home. (shared ventilation.) if you can't move to a smoke-free home, the only other sure way to protect your baby is to convince the smoker to take it outside. They can still smoke, but they can let the baby become a non-smoker. It comes down to their convenience versus the baby's health.

Get them to quit: Of course, the best answer is to help them quit. In the meantime, have them smoke outside, and change clothes before holding the baby. Never allow smoking in the car. You might want to use a room or whole house hepa type filter as well. Still, this will not completely avoid the problems of second hand smoke exposure.