Marijuana can be absolutely addictive. Most do not develop a physical dependence, but psychological marijuana addiction is not at all uncommon in the area where I practice. I see no harm in recreational marijuana use most of the time. I see medical benefits for marijuana for specific conditions. But marijuana is not an across the board treatment for every condition.

Daily marijuana use affects memory and motivation. How is that going to benefit someone with clinical depression?

Topical preparations...those can be really beneficial for people. Edibles have a place. Smoking a joint....that does plenty of damage to the lungs. So even if it is helping mental health it can affect physical health.