I Have Been Smoking Pot, Off And On, For Over

I have been smoking pot, off and on, for over 30 years. The first time I smoked I was in my early teens, and i felt a little 'high', but mostly I felt normal and calm for the first time in my life. I did not know then that I had ADHD, depression, anxiety and a bit of OCD and PTSD (Officially diagnosed with these from about 18 to 28).

I have tried many medications over many years, but I unfortunately experience most of the negative side affects associated with the meds, so about 10 years ago I gave up and started smoking pot on a day basis again, which I have no negative side effects from.

I would like to take legal meds and/or supplements, but nothing seems to work as well or even close, for my depression and anxiety and my other issues.

It is frustrating to me that I cannot seem to find anything, or any combination of things that can make me feel normal and relaxed like pot does.

I have gone to college graduated with honors and have had a successful career all the while smoking pot daily.

Is there anything that works chemically similar in the body to pot, but that is legal?
Thank you