Unless you're career plans include running for public office, becoming an air traffic controller, or requiring a top secret security clearance, I wouldn't stress over it.
As an aside, there was a guy in my inpatient rehab group that was an air traffic controller at a major urban airport. He had ways to beat the random drug tests and landed planes whacked out of his gourd on prescription opiates.
And I'm flying tomorrow...
There was also a cop. My friend is a nurse and was using intravenous dilaudid at work...an actual Nurse Jackie.