There is a long way to go before the disease and all its aspects are understood fully, and, sadly, probably even further to go before we can say with confidence that the majority of cases will be curable. As a result, it's very important to do what you can to live a healthy lifestyle and help reduce your chances of falling ill.
There are a huge number of ways you can go about reducing the threat to yourself. One of the most obvious is to cut out smoking. Of course, that is easier said than done, but, if you are at all serious about improving your health you absolutely need to stop this highly damaging, highly addictive practice. Nicotine replacements could help as they are not carcinogenic and can provide you with something to keep your cravings in check, whilst sparing your mouth, throat and lungs from the harmful effects of the smoke.
Cutting back on alcohol, which, if you are a smoker, also tends to help with the quitting process, can be a very positive step in terms of your overall health and will put you at a lower risk of a variety of different ailments, with cancer being just one of the many good reasons to cut back on your intake.
When it comes to food it is very difficult to make specific recommendations (though that doesn't seem to stop self appointed health gurus from attempting the feat) as there are so many different factors that feed into the question of cancer that it's not really possible at this stage to point to a single aspect of your eating habits that are going to do you harm. However, there is no doubt that you should seek to maintain a healthy weight. If you allow yourself to become obese you will be inviting complications, and even if things don't get to such an extreme stage you will still be more in danger than need be if you're not paying attention to diet.
Skin damage can also be very harmful so it is wise to make sure you always take steps to cover up if you are going to be out in the sun and to apply sun cream appropriately.