Asbestos Stomach Cancer

He has had surgery already and had spleen, lymph nodes, and pancreas removed including his whole stomach. They now told us that he might need some light radiation. I’ve read a lot of articles on Chemo patients smoking, drinking(in tea) to relieve the side affects of treatment. Our concern is that since he is already eating so little from having his whole stomach removed that he won’t eat at all or too little once he starts undergoing chemo.

It will likely be a few weeks til he is ready for treatment since he is still recovering from surgery. My question is since he would be smoking it is it safe for him to do that. Would the smoke somehow be bad or dangerous for him??? I heard they offer it in pill form. Is this available everywhere and as effective as smoking it? These are not questions I would want to ask his doctor since it is illegal to purchase marijuana. Maybe it is. Who knows, but any and all of your help is appreciated.
The patient is my father and we live in Chicago.