It's really appreciable that you quit tobacco, yeah for white and brown patches consult to your dentist , it will get overcome with time , yeah in some cases it is common to some extent but if it is harming you then no .
Next Steps
use multimineral and multivitamins supplement in your diet , have diet rich in Vit A , vit C , vit B complex, vit k , and iron rich diet .
continue facial exercises and physiotherapy
maintain oral hygiene
Health Tips
don't take too much stress , it will get reduced with time, stay calm and healthy