With THC being psychoactive, there really can't be any set formula like there can be for alcohol. (Like body weight/number of drinks/food intake, etc basically effects almost everyone in a similar fashion) I know people who absolutely should NOT ever mess w/ THC. And I also know people who can barely function without it. It effects everyone very differently. I know people that can't get off the couch and are a brainless sack of **** when they're high. And I know people that successfully run businesses and won't leave the house until they are. I've known Dr's, lawyers, and even ex cops who partake, and for them, it's purely medicinal. They are actually motivated, get stuff done, focused, and clearheaded. Without it, they are frantic, hyper, and easily side tracked. It's known to do wonders in many folks w/ PTSD.
Again, not condoning. Not recommending. But I do strongly encourage the continued studies of it's many positive medicinal values. Especially for chemo patients and the like.