If you keep telling yourself, "I don't want to get cancer," the brain will hear "I DO want to get cancer" because the subconscous doesn't remember the word "NOT." That's why when people say "don't forget to..." we tend to forget! And that's why hypnotists will be very sure to put things positively, such as "I am smoke-free" rather than "I don't smoke."
So be sure to tell yourself "Every day, in every way, I'm getting better and better!" and the universe will respond by leading you twards what you need to know and do and have.