Pure THC oil for cancer is used for issues such as anxiety attacks, poor sleep and epilepsy. It is also used as a pain reliever for chronic pain and psychoses. The fact that pure THC oil for cancer oil actually helps and relieves pain or has other positive effects has never been fully proven. It is likely that this form of THC cannabis oil offers relief for people with the all the above mentioned diseases. We know this from the many stories of people who have used it or still use it.