lawmakers and voters approved the use of marijuana for 40 different conditions, including leukaemia, looup us, cancer. there's not much medical research, because it's classified as a schedule 1 drug, making it difficult for scientists to study it. joining us now, chair of the department of the medicine of hospital for special surgery. does marijuana help the conditions, really? >> i don't know that we know that it does. i learnt weeks ago that two diseases, looup us and rumah toyed arthritis were listed by the legislature, two diseases that they were considering approving for treatment with medical majorca. the new york state, i guess, saw the light and did take those diseases off the list before the bill was finalised. i was surprised and concerned. not only is there not good evidence in resume toyed arthritis and no evidence in looup us. i was concerned that medical marijuana could be damaging it patients with those diseases. >> we heard about cancer when it comes to chemotherapy and helping people with nausea as a result of that. there are is a lot of anecdotal evidence saying this it help