We had a good number of guys who toked at sea. But we also had a good number of captain's masts because of it. I tried it once at sea, but it made me too paranoid.
When I was at Group Corpus Christi, one of our 82 footer's made a 12 ton bust. My buddies at one of the small boat stations (Port Aransas) helped the DEA unload the bales and made sure that a good amount fell on the ground for later use.
Another time when I was on watch in the operation center of the air station, one of our helicopter's brought in a bale it found floating in the gulf. They stored it in our parking lot and the Commander told me to keep an eye on it from the 2nd floor so as to make sure it was not getting smaller. My roomate was begging me to turn my head when he went back to his car - I said no as I felt the Commander was testing me. I had been busted in rank just a couple months before for pot smoking and I did not want to get in any more trouble. I gained the rank of E5 twice, but alas, I did not get out of the Coast Guard with a good conduct award.