anon43556, Please check your facts.
It is considered treatable to a degree, but certainly not curable.
There are but few treatments available, and many respond well to these.
They may not work for everyonee, and furthermore, many medications can also produce negative side effects.
To see a chart of medications sometimes used to treat narcolepsy, try the Stanford medical school where there is a research center devoted to sleep disorders, particularly narcolepsy.
Anti-depressants are only helpful for some patients, not all.
There is to my knowledge only one benzodiazepine in use for treatment of narcolepsy, as opposed to a long list of many other anticatapletic or hypnotic compounds, and/or stimulants. Medications must be tailored per patient.
Cannabis will not cause a person to have narcolepsy. Someone who is currently using cannabis *may* experience narcolepsy-like symptoms during use, but these subside with cessation of cannabis use. This is called "being high", and is in distinct contrast to true narcolepsy which does not just spontaneously 'go away' (with or without use of cannabis).
There have been cases of patients self-medicating (particularly for cataplexy) with cannabis, and this application could prove useful, as some research has found it likewise helpful for epilepsy.