Unfortunately, there are no proven methods to prevent leukemia. Most of the risk factors for leukemia, such as aging or Down syndrome, are unavoidable.
Smoking is the biggest risk factor you can avoid. One in every four cases of leukemia is linked to smoking. If you smoke cigarettes, now is the time to quit. Smoking also puts you at risk for other kinds of cancer.
Another risk factor you can be avoided is prolonged exposure to benzene. If your job requires you to handle large quantities of gasoline, paint, industrial solvents, plastics, pesticides or detergents, take precautions (like wearing the proper safety equipment) to limit your exposure.