Pre mix proper 2 stroke oil at a 3 oz to one US gallon ratio (43 to 1)... It won't smoke too much then... unless your
float level is too high,
or you float needle and seat are leaking,
or your petcock is leaking down some overnite
Smoke on a 2 stroke has nothing to do with the engine being worn out... like a 4 stroke engine in a car