I had a friend who had some chloroform and broke it out one night when we were all on acid, took turns lightly inhaling not to point of passing out but riiiight before.
I found it real pleasant, has a sweet smell.. I got the cloth taken from me cuz I was hogging it lol.
I think it would work just fine. You'd drift off and as long as the carteroid arteries are pressed on you should have a swift exit.
Just my .02 cents