I didn't know THC infused foods were so easy to make. Sounds like people should just skip the middle man and spray the distillate on candy themselves, and probably(?) save on huge markup.
THC is fat soluble so at the most basic level, infusing butter with cannabis flower will yield cannabutter which can then be used as a substitute for butter in just about any dish eg. The classic pot brownies you hear of.
The only complexity is dosing, which can be somewhat estimated if you can guess the potency of the flower. It's all a bit back of the napkin math, but you can get a decent estimate. One of my side projects (learning Vue.js) was a edible calculator for doing just this: http://www.scientificedibles.com