hello there....you have a condition called Oral submucous fibrosis
(OSMF)....Chewing tobacco would cause an irreversible condition known as Oral submucous fibrosis (OSMF)....muscles underneath your cheek gets rigid and looses its elastic property... we call that fibrosis...Once the elasticity of the muscles are lost you would loose the ability to open mouth... Continuos chewing of tobacco would result in depletion of glycogen
to the muscles...the muscle becomes fatigue
....blood supply decreases...As this happens your muscles tend to get more fibrosed. Based upon the severity, in terms of mouth opening, the management plan differs...This has nothing to do with the TM joint
If you are unable to open more than 1 finger space then you are a candidate for surgery... You are bound to get very good results with regular mouth opening if operated properly...Get your evaluated and examined by a Oral and Maxillofacilal Surgeon only...These specialists are experts in managing these conditions...Medication wont improve...Get yourself evaluated...