Availability of Marijuana for Adult Use; Revising the sales tax exemption for the sale of marijuana and marijuana delivery devices to apply only to purchases by qualified patients and caregivers; revising provisions related to the licensure and functions of medical marijuana treatment centers (MMTCs); deleting a requirement that each MMTC produce and make available for purchase at least one low-THC cannabis product; requiring cultivation facilities and processing facilities to be insured with specified hazard and liability insurance; authorizing a person 21 years of age or older to purchase marijuana products, marijuana in a form for smoking, and marijuana delivery devices under certain circumstances, etc.