1, When you ask yourself don't think of something, You will think of that thing, In this case it is Cancer.

2, Cancer cells are immortal, So it might be beneficial for your cells to turn cancerous, Cancer cells ignore the signals to kill themselves, Just like what you would do if anyone tells you to do so, To make things worse, I actually want immortality.

3, Some studies suggest cells are "sentient", If you constantly thinking about it, Since it is your body, Your cells might actually "listen to you" and turn cancerous, , In this case you don't want your cells to.

4, You can't stop thinking about it since it frightens you so much and it's the "potential" enemy from within, And there is nothing you can do.

Holy...F...It is messed up, How to get out?