It seems likely that two weeks of heavy, direct exposure to second hand smoke may very well affect your family's health. Even short-term exposure in people with histories of asthma and allergies can be enough to aggravate their conditions. I have seen young children from smoke-free homes develop ear infections, coughs and wheezing when they stayed several days in a home where smoking was allowed. And these health consequences can persist even after your visit is over. Second hand smoke may also affect your breastmilk.
Nicotine enters readily into mothers' milk and has a half-life of close to two hours.
That means it takes about two hours for 50 percent of it to clear your system. If your family is unwilling to take smoke breaks outside for a while prior to your trip and during your visit, perhaps you may want to reconsider staying with them. Air out these areas by opening up a window. Also, be sure to plan lots of outside activities, allowing your family to breathe clean air. For more information, please read, Secondhand Smoke in Your Home , published by the Centers for Disease Control, and make a copy to share with your family.