Thanks for query,
It is the best thing you did is stopped smoking
if you did not stop this white patch
might turned into pre cancerous lesion by this now.
Remaining patch you do not worry,gradually it will subside.
it seems that the patch you got in the chick might have sub mucous fibrosis
now never start smoking.
Do Feel fresh gargles.
continue the vitamines you take.
ok and bye.