Is it a bad idea to go to the doctor's office high?

Say you have a five-hour bus ride and you’d like to eat a pot brownie that morning to spice up the ride a little. However, you have a doctor’s appointment later on that day. You think you’d be able to talk to the doctor normally, but will she notice when she takes your blood pressure and stuff? It’s not a physical or anything, you’re just talking about your stomach.

Also, if she does catch on, can you get in legal trouble?