Why Does Smoking Meth Hurt Your Kidney?

I use to smoke meth alot, but I stayed clean for two years. Recently I got a bit depressed and started smoking it again. But Now my left kidney hurts and Im not sure why. I stayed highdrated but it continues to hurt. It feels sore not intense pain like a kidney stone. So I quit smoking it again but it still hurts. I need to know what I did to myself and how to fix it.