It would be legal when? where? work? kids?
Its not even a well-thought out idea.
Prop 19 is not well laid out and will probably have unforseen reprocussions, but if passed, it would make it legal to have less than an ounce, grow your own in limited area and supply, etc. A couple weeks ago, Arnie signed a law making less than an ounce to be an infraction, reducing it from a misdemeaner. All this of course is only for 21+ year olds.
I’ve read the arguments for and against and neither camp makes very good arguments.
The prop lays the legality of it out nice and neat. You might want to get a copy of it and read it. Not legal for kids or even legal to smoke it in front of a minor. Many of the same rules governing alcohol consumption.