What is the likelihood of oral cancer in my 20s and i don't smoke or drink but occasionally exposed to 2nd hand smoke?

Near nil: You have no risk factors, with the only unknown being the status of hpv infection. Keeping up with the healthful habits you are into is helpful.

The current hot: Topic is for the human papiloma virus, hpv, types 16 & 18. These are associated for sure with throat cancers (oropharynx), and many assume oral (tongue, cheek, floor of mouth, alveolar ridge) but im not sure. Many believe these viruses, which cause cervix cancer & genital warts, access the upper tract sexually. 2nd smoke a factor in lung, ? Oral cancer. I doubt it!