Hello Evans. Thanks for your query.
Smoking can lead to irritation and denuding of surface epithelium which can give rise to oral thrush
or apthous like feeling, which is temporary. However it can also give rise to serious precancerous conditions like leukoplakia
and oral submocous fibrosis. Its nice that you have cut down on your smoking. Your condition may also be due to deficiency of B complex vitamins specially riboflavin
. I suggest you take B complex vitamin supplements along with vitamin C
and proper amount of fluids. Infection is unlikely, although if its unhealing, apply metronidazole
gel. Thank you and wish you good health.