Your doctor should have told you about all possible ways of using marijuana. However now there is a lot of useful information on the Internet, for example, here
http://www.ncsm.nl/english/diy/best-ways-smoke-hash is a very informative article about how best to smoke a hash. You can also cook food with marijuana or use cannabutter, but for this you will need a large amount of marijuana. You can use the marijuana through a bong or a vape, As far as I know, this is less harmful to health than a joint.