She (my friend) said that she specifically tried two drugs for nausea and they did not work for her. I believe she said "Zofran" was one of them. The reason why the marijuana was effective for her was that it was inhaled as opposed to swallowed, and it gave her her appetite back.
Zofran is held under the tongue until it disolves. I can't see that as being any worse than drawing hot gas into your lungs.