You are put under general anaesthetic
(put under). Honestly, she could probably be okay as long as she tells them she's a SMOKER. That way they'll monitor her respiration even closer. Pot is a downer but it's probably going to be okay since they'll be monitoring her. It will probably keep her calmer before surgery, too. I'm not condoning it but I think it's not going to be "that" much of an influence, especially if she's "normally" stoned.