Well don't start smoking and avoid second hand smoke as much as you can. And eat a healthy balanced diet with lots of fruits and vegetables for protective antioxidants.
Known risk factors for lung cancer include: smoking, exposure to second hand smoke, air pollution, low intake of fruits and vegetables, high intake of foods rich in fat, asbestos, exposure to radon, and other environmental exposures.
Hope this is helpful to you. Best wishes and good luck.
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