Anticipation High
The high you get when you are about to use a drug. Not an actual high, but a feeling of being high before you get high. Similar to a contact high. Can make the police think you are high when they pull you over, but you were simply looking forward to getting high.
"Dude, did you smoke up before i got here?"
"Nah man, it's just an anticipation high."
"Nah man, it's just an anticipation high."