He is a really nice looking boy....
When I adopted my Goffin, she had been in a smoke filled house for four years; everyone that lived there was a chain smoker from what I was told. She smelled terrible and her feathers, those that she still had, were a dirty, beige colour. She screamed all the time, every time something or someone moved and it was not a good time....
We tried to have a lot of patience, fed her a healthy diet, supplemented her with some calcium and gave her love and time. We also put her in a more quiet (and less active) part of the house and she started to settle down. It took a while, but now we are three years later and she is great. She lets us know when she is unhappy and calls sometimes (strictly normal cockatoo chatter), but for the most part she is pretty quiet and happy. She was just at the vet for a full check up and passed with flying colours. At this point, one of her air sacs is a little compromised (vet expected this a little) , but the vet is happy that she is doing so well.
There is definitely a happy ending for a former cockatoo nicotine addict.....lol.
Patience, love and a healthy diet did the trick for us