Actually, it just lets your body cure itself. (See: How cannabis works part 1 and part 2).
Fred Gardner asks Jeffrey Hergenrather, a medical doctor in California who has experience treating patients with cannabis,
Q. What results do patients report? How does cannabis appear to work in treating their symptoms?
A cannabis specialist soon becomes aware of two remarkable facts. The range of conditions that patients are treating successfully with cannabis is extremely wide; and patients get relief with the use of cannabis that they cannot achieve with any other pharmaceuticals.
The testimonies that I hear on a daily basis from people with serious medical conditions are moving and illuminating. From many people with cancer and AIDS come reports that cannabis has saved their lives by giving them an appetite, the ability to keep down their medications, and mental ease. No other drug works like cannabis to reduce or eliminate pain without significant adverse effects. It evidently works on parts of the brain involving short-term memory and pain centers, enabling the patient to stop dwelling on pain. Cannabis helps with muscle relaxation, and it has an anti-inflammatory action. Patients with rheumatoid arthritis stabilize with fewer and less destructive flare-ups with the regular use of cannabis.
Other rheumatic diseases similarly show remissions. Spasticity cannot be treated any more quickly or efficiently than with cannabis, and, again, without significant adverse effects.
Patients who suffer from migraines can reduce or omit conventional medications as their headaches become less frequent and less severe.
About half of the patients with mood disorders find that they are adequately treated with cannabis alone while others reduce their need for other pharmaceuticals. In my opinion, there is no better drug for the treatment of anxiety disorders, brain trauma and post concussion syndrome, ADD and ADHD, obsessive compulsive disorder, and post-traumatic stress disorder. Patients with Crohn’s disease and ulcerative colitis are stabilized, usually with comfort and weight gain, while most are able to avoid use of steroids and other potent immunomodulator drugs.
People who were formerly dependent on alcohol, opiates, amphetamines and other addictive drugs have had their lives changed when substituting with cannabis. Patients with end-stage renal disease on dialysis and those with transplanted kidneys show mental ease, comfort, and lack of significant graft-versus-host incompatibility reactions in my small series.
Diabetics report slightly lower and easier-to-control blood sugar levels, yet to be studied and explained.
Sleep patterns are typically improved, with longer and deeper sleep without any hangover or significant adverse effects.
Many patients with multiple sclerosis report that their condition has not worsened for many years while they have been using cannabis regularly. MS and other neurodegenerative diseases share the common benefits of reduced pain and muscle spasms, improved appetite, improved mood and fewer incontinence problems. Many patients with epilepsy are adequately treated with or without the use of other anticonvulsants.
Patients with skin conditions associated with systemic disease such as psoriasis, lupus, dermatitis herpetiformis, and eczema all report easement and less itching when using cannabis regularly.
Airway diseases such as asthma, sleep apnea, COPD, and chronic sinusitis deserve special mention because I encourage the use of cannabis vapor or ingested forms rather than smoking to reduce airway irritation. Finally, most obese and morbidly obese patients respond with weight loss and improved self esteem. I believe that cannabis and psychotherapy work well together in fostering behavioral changes.
There are a bunch more questions and answers, fascinating interview.
Hat-tip to global_warming.