Don't smoke. Breaking the tobacco habit may be difficult, but it can be done. While preparing to quit, cut back on the number of cigarettes smoked daily. Many people report that stopping cigarette smoking "cold turkey" is more effective than gradually tapering off. Joining a support group may help you maintain the resolve to quit.
If you live or work with smokers, encourage them to quit and ask them not to smoke around you. If there is potential exposure to cancer-causing chemicals at work, take necessary safety measures to limit inhalation.
As far as treatment goes, if the lung cancer can be successfully removed with surgery, the patient has an excellent chance of surviving at least one year, and usually a better than 50% chance of living for five years or more after that. The challenge is detecting lung cancer early enough to make surgery possible.