Beginning January 1, 2020 residents can possess up to 30 grams of plant cannabis.  Lower limits are allowed for concentrate and edibles.  Out of state residents may possess a lesser amount.  Only licensed medical marijuana dispensaries will be permitted to sell initially.  However, other businesses will be granted licenses as time progresses.  Users must be 21 or older and have restrictions upon usage.  Businesses may be designated as authorized usage areas.  See my blog for more specifics on the limits and prohibitions.