I find cannabis to be tremendously helpful in calming my PTSD issues, and clearing my mind so that I can be present and focus on the now instead of burdens from the past or fear of the future. I live in a medical state so the worry about prosecution is the lowest I've experienced in 20 years of enjoying it. I've had a few times where I've spent 'time off' and while it wasn't painful, I did enjoy resuming when I was done with the time off. I consume it like a vitamin and a vegetable, and am still capable of doing things that require skill (before, during, and after), and little things that used to set me off I feel more comfortable just shrugging off. I've actually made more progress in the last year than I did in the previous 19, so I don't think it's acting as a substitute for real therapy or progress. I've seen people have terrible outcomes from SSRIs, opioid painkillers, and all the various psychopharma cocktails and I've avoided a pharma-based treatment regimen for this reason.
It's not for everyone, but it's certainly nothing to be locking people up over. It boggles my mind that guns can be purchased freely but a harmless, non-toxic plant, a substance that is medically safer than anything you have in your medicine cabinet or anything you can buy at the bar, is grounds for imprisonment (depending on where you live).