Can smokeless tobacco cause oral cancer?

Yes: Tobacco is one of the risk factor for oral cancer in addition to alcohol and other things.

Yes, and Often Does: Over time the nicotine in the tobacco leaches out of the smokeless tobacco and decreases blood flow to the cheek and gum mucous membranes. This mucosa becomes more permeable to the 200+ cancer producing chemicals in tobacco. If you drink alcohol, the alcohol increases carcinogensis by extracting the carcinogens and enhancing their penetration into the mucosa. Stop if you can, or get help to stop.

Yes: There are more cancer producing chemicals in tobacco than letters in your question. And treatment often requires radical facial surgery. Oral cancer is particularly virulent. Tobacco, irrespective of the delivery system, is an ugly killer.