There is obvious Tobacco stains in your mouth.( From the pic).
Cannot completely comment the precancerous lesions, because there is lot of hidden areas in mouth which is not visible in your pic.
Need more detailed information regarding the problems.
Chronic smoking can cause precancerous or cancerous lesions any where in the mouth, throat, tongue etc
Next Steps
Consult ENT surgeon, will require in person mouth & throat examination to rule out any conditions.