Why cannabis? It can relieve pain without nausea or other nasty side-effects.
Epileptic patients have said that, after using cannabis with their more conventional prescription drugs, they can wean themselves off the prescriptions and stay seizure-free as long as they continue using cannabis.
Cannabis may be a viable treatment for many forms of clinical depression, including bipolar disorder, where the cycles between depression and manic moods are less frequent while taking the drug.
Cannabis has been prescribed as a treatment for "sick headaches" - migraines - since the 19th century. Today, used with a prevention program, it offers fast, long-lasting relief.
The ancient Chinese can't be wrong: cannabis may be able to "undo" rheumatism.