Marijuana is now widely known to have substantial properties that can be used as medicine.
It is already used to treat various forms of cancer and is slowly becoming legalized in the many states of the USA.
In the past Hemp was used for all sorts of illnesses but after it was deemed an illegal drug it was important for doctors to look for a replacement. The replacement drugs were never as good and would give a number of side effects.
Medical cannabis today is much more understood and is now replacing many alternative medicines