I think the problem is that you were high either when you received the message or when you were giving it.

I haven't seen any real difference in my memory, though I've always had problems remembering stuff that wasn't important to myself or people important to me.

And if your friends gets pissed at you for forgetting a message, tell him to shut up, it's his fault for not being there to get it himself or for not being able to get in contact with his friend, you're not his secretary.

Though if you do take a message for someone in the future, just write it down so you won't forget.