While I believe it is overall less harmful than alcohol, I do not believe it is a good thing to get into. Will it hurt you to try it? Probably not. Could it affect your life negatively? Maybe. I've known people that try it, like it, and before too long do NOTHING but sit around either baked, or waiting to get baked. Is this everyone that tries pot? No, probably a small minority. Is breathing smoke into your lungs ever a good thing? Hardly.
My opinion is, there's a lot of things in life you can get a natural high from in life, why risk doing it illegaly?
As far as decriminalizing it, my main concern is I don't care to be around it... I'm not going to get drunk standing next to someone drinking a beer, if you take my meaning. I do think laws are to harsh for those with small amounts for personal use though.
*Looks down*
Damn soapbox...

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Put me on wheels and I'll turn tricks.

Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these