Hi...its good that u have quitted the habit atleast for now.The restricted mouth opening u have is due to the condition called Oral submucous fibrosis.Don't worry.It can be treated by eliminating the habit permanently,taking good nutritional diet,proper medications and physiotherapy.In severe cases surgical options are also available.
Next Steps
Visit the Oral medicine specialist immediately and get treated properly.
Health Tips
Advised to do regular dental check up and teeth cleaning every 6 months.