Participation in this study will last 1 year. First, all participating families will be visited at home by a study staff person who will attach special filters that will track the amount of nicotine in the various rooms of the house. During this initial visit, the participating children will undergo weight and height measurements and saliva sampling. About a week later, the filters will be collected, a 2nd saliva samples will be taken and parents will be interviewed about their family and child's health. Families will then be randomly assigned to one of two groups. Both groups will received educational information about reducing tobacco smoke exposure. One group will also receive the home-delivered, motivational interviewing-based program aimed to reduce ETS. This program will consist of 2 home visits and 2 phone calls, both led by health counselor who will teach participants how to reduce their child's exposure to tobacco smoke. The home visits will occur during Weeks 1 & 2 and the phone calls will occur during Weeks 3 & 6. Follow-up visits for all participating families will occur at Months 3,6 and 12 and will involve repeat filter testing, saliva monitoring and interviews.