Secondary marijuana can have an effect too. We were checking out of the hotel in Amsterdam, and the F.O. said he didn't feel well. He looked to be out of it. We went back to the corridor where his allocated room had been, and the smell was quite pervasive. Someone in another room had obviously been smoking a lot of the stuff. The F.O. called in sick. Luckily there was a standby available and the delay wasn't too long. The company read the riot act to the hotel.