While in general I agree with you - I do know people who make their own wine and beer; and certainly there are illegal stills out there.
In terms of growing pot - alas, my thumb isn't just non-green, it is known as "major-plant-killer" in certain groups; the Darth Vader of the plant killing world. So I will have to rely on the goodness of others to share their crops.
But certainly there are people much more adept than I growing their own pot currently; and who is to say their little tykes don't sometimes nip at the bud? We do tolerate parents deciding what's best for their young'uns up to the point where it's physically or mentally harmful (and, sad to say, sometimes beyond that point).