Thanks for sharing your concern.
Chewing tobacco can cause mouth cancer.
The important signs of cancer are painless lump in any part of mouth like buccal mucosa(cheek),lip,palate
,floor of mouth or the alveolar bone.
It can become secondarily infected upon exposure and become painful.
Slowly it progress in size causing difficulty in eating,chewing,swallowing and general discomfort.
In that case, it is best to consult an oral surgeon for biopsy
There are many de addiction centers opened.you can approach there.also drug therapy is given to discontinue tobacco usage.
Most importantly, it is your will power and desire to quit the habit is very important.
Hope i have answered your query.