You do know that they make a synthetic form of MaryJane - it's called Marinol.
Had a go worker who had throat cancer (he was a smoker all his life.) He said they had to "bake" his body with radiation and chemo to try and kill the cancer. He said the Marinol did help his pain and nausea.
I think a doc from any old state can write an RX for this stuff, but hey, if you want to inhale, go for it!