I am a college student about to graduate with a job offer lined up in the civilian sector that requires a security clearance. I applied for a previous job that in the process gave me a secret clearance and in pure recklessness put no under drug use for the SF-86 application. for the most part I’m a pretty clean and straight forward person with no real drug use and don’t drink alcohol either except for smoking pot once at a party in college before my security clearance, and have not smoked and barely drank since. I feel extremely guilty for lying and I was thinking if I come clean before my first renewal about my one time use I could possibly mitigate the lie. What can I do?