Had a cough now for over 2 weeks now and it's drivin me mad, anyone know how to get rid of it?

I was sitting outside pub with friends who smoke (I dont smoke) and inhaled a lot of cigarette smoke, a couple of days later my chest was really sore and then I got a cold, the cold went but the sore chest stayed and I also developed a cough, it's driving me mad!! I cough up a lot of mucus and i get a tickle and the back if my throat, it seems to be getting worse and now the mucus has gone from clear to green. It seems to be worse when I wake up and on a night, any ideas as to wot it cud be and how to get rid of it?