If there is absolutely no evidence to prove that you smoked pot, don't bother telling them.
I'm not sure how long that stuff stays in your system, though. If you know for sure that it's out, don't tell them.
And yeah, you might want to delete this question, just to be safe.
Also, don't worry about minor stuff. Nope, you've never broken a bone, gotten sick, had a headache, etc. I'm not saying that you should lie your *** off, I'm saying that if it was minor/temporary and won't affect your life in any way after it happened, don't bother telling them.
"YOU SHALL NOT PASS"- MEPS
went to MEPS a month ago.