Hey dude, as I have said many times before on these boards the weed wont stop the pain, it'll just make you forget about the pain! When first smoked Cannabis is more of a bodily high, but after a while it turns more pshycological and will make you forget about the fact your back hurts.

Your best off smoking Green rather than any sort of solid/hashish! The most effective way to reep the rewards without the damage and fact you "dont particularly want to get high", would be to vaporise although you WILL BE HIGH, I'm not actually sure you can take weed without getting a high. As eating it gets you the most baked!

Good luck in your next quest bruv!