Agree with Ryasco - don't forget the number one reason prohibition is breaking down - people refused to comply with the law.
Personally I have a very simple rule - support and advocate for good laws, fight against bad laws.
Bill or referendums that ban home growing of cannabis are bad laws - they're Prohibition laws. Many people in Washington state fought very hard against the shitty law funded by the oligarchs that banned home growing. Medical patients were told everything would be OK, and they were lied to. The medMJ program and protections were devastated. Many people have been prosecuted for DUI under the bullshit per se law as well.
As of today, Washington isn't even close to "allowing" home growing. I disagree that a bad law is a step toward a good law. That is not how it works. The government tends to tighten laws and regs as time goes on, not loosen them. Just look at Prop. 215 in 1996.
Prop. 215 was wide-open full legalization of cannabis. Get a doctor's order and it's legal. Anyone can sell it, anyone can grow, no limits on possession, no limits on plants, no taxes, no fees, no mandatory registration with the government.
The oligarchs saw Prop. 215 as a serious wake-up call and ever since then they have funded and steered the movement towards locking down cannabis. Every law and referendum since 215 is more restrictive than the last. Mass. and Maine are rare exceptions, where the law actually pushed further ahead. This is because of very strong activist presence in both states. MPP had to back down and support better laws because local activists forced them to.
And look what happened. The state govts. in both states gutted the laws and made them weaker (happened in Mass., currently in progress in Maine). Cannabis that costs $400 per ounce, and no home growing, is not legal cannabis. In fact it's almost identical to Prohibition, with a few politically-connected players taking all the profits. Goldman Sachs investors actually own all the dispnesaries in NY state and several of the ones in Mass.