Legal, illegal, doesn't make much of a difference IMO.
Cannabis is such a common plant to come across by that even in a shit place where nobody has any sort of drugs, jobs or money someone always has some weed.
It is rarely laced and 99% of the times you know what you're getting. Doesn't matter if it's sativa, indica, hybrid, landrace or some crazy new genetic mix they have going on all of them contain THC and CBD.
Even if you don't get a fancy pharmaceutical grade oil, or a capsule containing purified cannabanoids why does it matter?
It's easy to come across by, as accessible as beer, easy to grow, high yield and not all parts of the plant will get you high if you're not up to it and you still get the medicinal effects.
You like to get high too? Well, you can do that too and get your medicinal benefits.
As history has already shown us... Banning something will not prevent people from manufacturing it, selling, buying or "keep the streets clean". Who wants it and/or needs it will find a way to get it.
If cannabis was legal to begin with probably nobody would bother to make such a thing as CBD oil, instead shops would sell hashish, hemp leaf tea (with CBD of course), maybe even some bud much like they do with other herbal products.