i dunno bout curing cancer and all that malarky mate, but yeah off course it has it use's medically we been using it medically for 100s maybe 1000s of yrs now, relax's you, increase's your appetite, helps with pain deffo it has its use's on a medical side if taken right and not abused.
i think alot of my opinion mg comes from what it does to me personally and i no how it can send me nuts on top of seeing alot of people over the years much the same as me, but im and the people i talk of are the minority most peeps can smoke it and be fine even abuse it and still be fine.