I have pain in throat. mabye thyroid gland when touching. no other symptoms. i smoke 1 pack of cigaret. ?

Get evaluated.: If you have pain in your throat that is long standing, then you need to be seen. Pain in the throat is different than pain in the neck - I am not sure which you are describing. If the sore throat is new, you can wait a day or two and see if it improves, but get seen if you have a fever, redness or increased pain in the neck or throat.

Throat pain: A sore throat is likely due to pharyngitis (viral is most likely; however, if fevers and persistent you would want to rule out bacterial). Smoking is also an irritant and can contribute to throat discomfort. Quitting smoking is best for your health in general. If you can feel your thyroid gland, have a doctor exam it - they will be able to determine if it needs further evaluation/tests.

Go see your doctor!: Yeah, I know I sound like a broken record (back when there was such a thing) but it's true. Sure, you need to quit smoking but you already know that. The problem is that pain in your throat. I can't see back there so you need to go see your family doc so that s/he can take a peek. Hopefully it's nothing more than a virus or perhaps dryness from mouth breathing. But if lower down, then need ENT.