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The single most important way to cut your risk of getting this cancer (and most others) is by not smoking.
You can cut your risk further by not drinking heavily, especially spirits.
If you have had cancer of the larynx, giving up smoking and drinking less will reduce the risk of the cancer coming back. It will also reduce the side effects of treatment and help healing.
The World Cancer Research Fund has a leaflet about reducing your risk of mouth and throat cancers.