Actually, they have vending machines in pot dispensaries now.
When I was wondering which states would legalize dope first, my first thought wasn’t Alaska and Colorado. It was California, Oregon and Vermont.
Weird
Only in the dispensaries and only vending in a secure way: "To buy marijuana from the vending machine, Barrera said a valid medical marijuana card, registration into the machines system and a thumbprint are all needed." - http://sanfrancisco.cbslocal.com/2013/03/20/marijuana-vending-machines-popping-up-at-california-pot-clubs/