Constitutional protections

So its my understanding that Colorado legalized it by amending their constitution. Is this unique to there or have other places done this as well? In states where there has been a degree of legalization(medical or recreational), has there been any continued effort to extend that further to become a constitutionally-protected right?

Florida added Medical to the Constitution in 2016 with Amendment 2.
Amendment 2

Now there's litigation to allow smoking flowers.

That's great to hear that at least one other place has made some progress on enshrining it in their constitution. That should really be the standard model for everywhere IMO.