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As is the case in my area today, a couple kids will grow and supply and the rest will come from the Mexicans.

Are you claiming that a couple kids grow enough to supply a significant fraction of your area?

No. I watched them grow about 7 or 8 large plants.

Then kids growing is not relevant to whether kids will continue to get pot if it's legalized for adults. As for the Mexicans: minors don't have the purchasing power to sustain a significant black market, as witness the nonexistence of a significant black market in minor-desired alcohol. (And legal sellers of booze and cigs usually don't sell to minors because their legality for adults creates a clear incentive to not break the laws against doing so.)