I did chewing tobbaco once. do i have oral cancer now?

Chewing Tobacco: While chewing tobacco is a risk for oral cancer, it is unlikely that a limited exposure would cause it. Your dentist can perform a good oral cancer exam. He will look for a white patch on the oral mucosa that doesn't scrape off or a lump on the tongue, oral tissues, or soft palate or tonsil.

Probably not: A one time use would be rare. If you want to make 100% sure, see your local dentist that has velscope to check the area for cancerous activity. He or she will also check the rest of your mouth.

I don't think so.: According to the national cancer institute chewing tobbaco causes cancer. There is no "set" time as to when chewing will cause cancer, but it does if you used it for a short period of time, i don't think there would be a problem. If you are unsure, go have yourself checked by a dental professional.