Penalties vary widely in each state, for growing and selling it is almost always a felony. It can cause cancer in the lungs and the throat IF smoked. Marijuana takes away the discomfort and nausea associated with chemotherapy taken to stop the growth of cancer. It also helps people with glaucoma and it keeps them from going blind. It doesn't lessen feelings and pain, it heightens them.
Users say they hear things better, and they see details they have never seen before.
Controls could also be placed on the quantity, potency,, amount, price, time and place of sale, and age of buyers.