i had an ENT work on my nose due to coke. go for a consultation. however, unless you quit, you will just undo what he/she did for you. make sure you are finished with it.
do u still do cocoaine? and i am not sure about any therapies to restore smell//sometimes//often nerves regenerate..and i am not sure of ur extent of damage...and ENT could help more with this..and there r new procedures cropping up everyday..good luck with it