The numbers I have read are that smoking and/or heavy alcohol use are the primary causitive agent in around 80% of OC.

I quit smoking in 1976, pot in in 1986 and alcohol in 1995.

Go to this link: http://www.oralcancerfoundation.org/tobacco/index.htm

And then this one: http://www.sptimes.com/News/61599/Floridian/He_wanted_you_to_know.shtml

Gary Allsebrook
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Dx 11/22/02, SCC, 6 x 3 cm Polypoid tumor, rt tonsil, Stage III/IVA, T3N0M0 G1/2
Tx 1/28/03 - 3/19/03, Cisplatin ct x2, IMRT, bilateral, with boost, x35(69.96Gy)
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"You are a mist that appears for a little while and then vanishes" (James 4:14 NIV)