Hey there, I don't smoke tobacco, but I don't know how I would live without cannabis. I've used it for years to deal with menstrual cramps, anxiety, sleeplessness, nausea from pain or medicine, etc. Now that my situation has gotten worse, I smoke every day. It eases the cramps, it helps your mind calm so you can relax a bit, which can be difficult to do when your body is hurting so much, and it helps me get to sleep.
Mind you, I only smoke once I'm home for the evening and everything I need to do is done because it isn't exactly great for productivity, but I would be miserable without it. It boggles my mind that it's still illegal in so many countries. It isn't addictive, it's never killed anyone, unlike so many legal drugs including alcohol and tobacco, and it legitimately helps with a whole host of health issues. It's a beautiful natural plant that doesn't deserve the bad rep it has.
I don't know about man made oils, I just use the actual bud. It's saved me many a day.