Saint: possibly. you are placing a source of EM radiation near your brain. there have been some preliminary studies suggesting it does increase your chances of getting brain cnacer.
Also, while sharks are just as likely to get cancer, I believe that they are much less likely to die from it. the chemicals they produce with inhibits tumor growth is still being tested, but some of the blood-flow reducing drugs come from shark studies, IIRC.
The best way to lower your chances of getting cancer? moderation. Alittle of everything, not to much of anything. A little alcohol, a little sugar, a little meat, a little grain, a little fruit. a little more fruit and grain.
Don't cover your food with salt. don't fry all your starches. don't eat out alot. do grow alot of your own food, and avoide pesticides. do cook your own food. do eat alot of raw, clean veggies and fruits. do spend time doing relaxing activities (not watching TV or spacing. activly doing something relaxing). use your brain to help avoid alztimers
basically, be boring, and enjoy every minute of it.
You have a certain propesity to get cancewr. this is genetic. however, your lifestyle can increase or decrease the chances that the genetic probability becomes more relevent. Also, there are some cancers which come nearly 100% from the environement. EM radiation, high levels of chemicals, etc. Check your family medical history for which types of cancer you are more likely to get, and do what you can to reduce the chances of gettign one of those cancers.