hello and welcome to HCM,
First of all let me mention that there can be all kinds of lumps and bumps in the throat and also color changes majority of which turn out to be normal.
Having said that you must realize that since you are a smoker, a constant risk of any cancer is automatically increased in your case and even in this case unless the doctor examines the bumps and or maybe even biopsies them we cannot be sure.
You also have a sore throat
which goes away when you quit smoking
means that you have a reflux which becomes better when you stop smoking.
In effect it all boils
down to your smoking and since you have understood the need to stop you should definitely work towards the complete cessation of smoking gradually
meanwhile stop all spicy, oily food and take balanced healthy diet
Get an ENT consult and get an upper GI endoscopy
to get a better picture
Dr Sriram Nathan