You've Snorted a Drug, Even Just Once
Hepatitis C is most commonly caused by injection drug use; all it takes is exposure to the virus through a needle or syringe used just once, and even if it was years ago, says the CDC. But sharing other drug paraphernalia can also transmit the virus.
https://www.everydayhealth.com/hs/hepatitis-c-guide/surprising-hcv-risk-factors/