How do you detox your lungs from exposure to cigarette smoke?

Stop exposing them: The good news: a few hours after you stop breathing smoke, your body starts healing from its damaging effects. Heart rate drops. Carbon monoxide levels drop to normal. In a few weeks, your lungs work better. Within a year, your risk for heart disease is half what it was. Withing 15 years, you have no greater risk for respiratory cancers than a non smoker.