Several times in high school.
I was the “quiet type” so no one suspected. I would hang out with some friends occasionally and try weed and/or booze before coming home from school. I would just shower, do my hair, makeup, eat dinner and get ready for the meeting as usual (usually the school and service meetings). I was not sloppy or excessive so no one noticed anything. I know I wasn’t the only one. I knew of an elder that would come slighted toasted every now and then and a few of the folks in my age group regularly got high before the School and Service Meetings because it was easier on the weekdays than the Sunday meetings.
Also, on our bowling nights (Saturday before the Sunday talks) we would hit the bar at the alley where they didnt check ID, and stay out until 3:00AM (parents were cool with us staying out late because we were with "friends".) The next mornings we always fun - especially when we had to get up for 9:30 meetings.