Hi Angelsrock,
As has been mentioned, it's NOT cancer until they say it's cancer! I know it's easier said than done but try to relax and stay away from Dr.Google! Could be any number of reasons they changed the appointment.
Now, regardless of the result... smoking! C'mon now! You have to stop! I was a smoker (cigarettes, pipe and cigar) for 35 years. I quit last year prior to my diagnosis. Do I miss it? Absolutely! There are times even now where I crave a good stogie but the thought of treatment and what I went through quickly quells the urge.
I used the electronic cigarette to quit. You can step down in the amount of nicotine until you reach zero. It's a vapor that delivers the nicotine and it "feels" like you're smoking. Even my docs said it was better than inhaling the 4000 chemicals that are in tobacco smoke. For your health and your children, please quit!
Positive thoughts and prayers,
"T"