They've been circumcising people for thousands of years - religious reasons etc.
As far as I know, Jews are still born with a foreskin, imagine all the fun they'd miss out on if they came out with no foreskin, they'd start mutilating their nut sack as compensation.
Well just google organic MJ food. I'm doing an outdoor grow at the moment, and I just use organic fertilizers. Cow manure (composted) is a good manure because it isn't 'hot'.
Those spots can be caused by pH fluctuations, focus on maintaining a constant pH, and don't worry about the old damaged leaves. They will not repair, just focus on the new growth.
GL.
C90