Helping smokers to quit involves 2 processes motivating them to attempt to quit and helping them to stop once they try. At any given time, only about 10% of smokers are planning to quit in the next month, 30% are contemplating to quit in the next 6 months, 30% plan to quit at some unknown time, and 30% have no plans to quit; thus, the large majority of clinician interventions involve motivating smokers to try to stop.
Smoking releases thousands of chemicals into your body. The result is not only damage to your lungs, but also your heart and many other body structures. Even if you have smoked for many years, you can reverse these effects and experience benefits from the first hours you stop smoking to the decades after you quit.