A Smoke-Free Home Intervention in Tribal Communities is a clinical trial aiming to help people in rural tribal areas reduce exposure to secondhand smoke. Secondhand smoke is the harmful smoke that comes from someone else's cigarette. The study wants to see if making homes smoke-free can help improve health and reduce the risk of cancer. Participants in the study will be split into two groups. One group will receive information and a coaching call on how to keep their homes smoke-free. The other group will continue with their usual habits but can choose to try the smoke-free program later. Everyone in the study will be checked on after 3 and 6 months to see how they're doing.

• Eligible participants are 18 years or older, smoke or live with a smoker, and do not live in a smoke-free home.
• The study will last 6 months, with follow-up visits.
• Participants in the smoke-free group receive educational materials and a coaching call.