Anything can be harmed by excessive misuse. Premature ejaculation is a commom feature among men who utilize and masturbation regularly. There was even a movie with that hot lady Julian Moore along this issue. I wish I recalled the movie's name. It tackled this isue of addiction where a young actor had issues having sex with women because he had certain needs for him to be aroused. And if he tried to express his thoughts, he was afraid to freak the woman out. But he required help in getting aroused sinply because his brain wouldn't budge at the sight of a naked woman. he wanted certain dresses, certain poses, something aprticualr to trigger that sexual urge. I am certain they did a research for the movie to make it credible.
Also, stories of premature ejaculation by young men are plenty because of addiction and masturbation. Anything exceeding the limtis of tolerance can backfire including sugar in take of the body. Everything is measured for a reason.
Well..i guess i will have to trust your judgement in this since u appear an expert. I do agree everything is measured in this world though. That is why Islam encourage moderation in everything, I think Allaah swt has created this world with precision mathematics, when we discover the formula, it will be too late. Yomul Qiyama.