No offence, but how can you expect no negative effects and reduction in crime when new crimes have been introduced; more crimes have been introduced than pardoned actually. Amnesty for tiny possession amounts doesn't mean anything when the police can warrantless search you or your house or decide to arrest you for public intoxication.
Don't forget drivers who get arrested for intoxication by a faulty test that only detects if they're a cannabis user in general. People who have pioneered this industry are having their legitimate businesses closed and are facing life sentences in prison. Patients who need affordable and reliable access to large quantities of high-quality, organic cannabis products have to choose between staying alive or life sentences in prison.