If you are so worried you could always visit your local doctor and have him look at things. The fact that you have this idea in your head about cancer is just going to cause you more anxiety. Cutting back on smokes can, at times, cause such things. Because you are not taken in the same amount of nicotine at you had been for a long time. You could try gargle with salt and water. No swallowing. Just swish about and spit back out. See if that helps you any at all. Honey is also a good thing. But if there is no improvement visit a doctor.