Is there anybody alive in the United States today who does NOT know that smoking tobacco is the leading cause of lung cancer? Probably not. To avoid that knowledge, you'd have to live under a rock. There isn't any way to absolutely prevent lung cancer, but never smoking or quitting smoking is one way to significantly lower the risk.

There are, however, other risk factors associated with lung cancer that we have no control over at all. There are environmental causes, that we just can't do anything about. Such things as asbestos, radon, arsenic, chromium, nickel, tar, and soot that are commonly found in the workplace can cause lung cancer in people who have never smoked. The United States and other countries are working to control these substances in the workplace and some progress has been made - not enough, but some.

Just plain old air pollution is another cause of lung cancer. The incidence of lung cancer is higher in cities where air pollution is worse.

Studies have shown that a good diet that is high in fruits, vegetables, and whole grains and low in saturated fat, red meat, and preservatives does lower the risk of contracting lung cancer.

Abstaining from alcohol consumption altogether is another way to lower your risk of contracting lung cancer.

Research shows that people who are physically active have at a lower risk for developing lung cancer than those who are sedentary - and this is true even after taking cigarette smoking into account.

Using drugs, vitamins, or other agents to try to reduce the risk of, or delay the development or recurrence of, cancer is called chemoprevention. This is an area that scientists are studying, and there are clinical trials in progress that are testing both natural as well as man-made drugs, but it has not become a standard treatment or therapy.