>> alan tonkin is not trying to quit smoking. in fact, instead of nicotine, this 2 x 2 square is delivering thc. >> i've been using medical marijuana for about the past 11 years. >> ever since a sky diving accident broke his back, his pain reliever of choice is weed. but smoking breaks at work, well -- >> i don't like smelling like marijuana around customers. this allows me to be more discreet about taking my medicine. >> this is basically where all the magic happens. >> the magic's happening at mary's medicinals in denver. nicole smith gives us a tour saying unlike smoking pot which wears off...