Do you just make this shit up?
It is not illegal in CO to get weed from anyone, but it is illegal to sell weed without proper licensing.
If you're communicating with someone else with the intent to "exchange, barter or traffic in, to solicit or receive and order except through a licensee [which don't yet exist]. . . to deliver [or encourage the other person to deliver] for value in any way other than gratuitously, to peddle or possess with intent to sell, or to traffic in for any consideration promised or obtained directly or indirectly[,]" then you're also engaged in a crime and subject to prosecution.
See Colo. HB 13-1317, to be codified at Colo. Rev. Stat. 12-43.4-103(22).
Chances may be slim, but it is a possibility unless you're talking about a true donation, with nothing changing hands other than the plant.