Your entire argument lies in that smoking too much skunk will ruin your mental health? (You worded it wrong, by the way, but I caught it anyway...perhaps you should stop smoking?)
In all seriousness though, this is in the same league as saying that marijuana will cause your brain cells to die. I mean, it's already been discovered to be bullshit, you only need to research a little. It is said that if you have a disposition towards mental illness, marijuana can speed up the process. But those people will go nutty in the long run anyhow, so what's new?