Hello Kayla!
Of all the cannabinoids, CBD is the one that shows the most promise for medical treatment, but in most strains of cannabis found on the market today, CBD levels are usually low to non existent, since the last few hundred years were spent cross-breeding strains to maximize THC content, another cannabinoid that has anti-inflammatory properties.
The science supports the possibility of cannabinoids inducing remission, but it has yet to be proven in vitro or even in a lab. There has been anecdotal reports of experienced cannabis users ingesting very potent cannabis oil every day, which got rid of their colitis after most other treatments had failed. But to make such an oil at a reasonable price, one must grow its own cannabis and therefore have the experience and resources.
I think in 50 years we'll have tablets or capsules made of cannabinoids and in high doses. Until then, using cannabis as a cure is not a good idea, unless you fall in the aforementioned group of experienced grower/user.