I'm suprised about the overall knowledge of weed on NG. It's next to nothing!
Weed, is called a soft drug because it doesn't have any severe consequences. Smoking weed is *way* less damaging than drinking alcohol. And is alcohol really that damaging? Of course, it would vary depending on the amount, but that's a fact for nearly everything.
I, myself, smoke weed weekly. If you've found a bag of weed as you said, then just roll a blunt with a bit of weed. Not much, just try it out for a bit. Do it at home ofc. It helps if you use a crusher first, because you can't smell weed if it's *really* crushed.
I say go for it. ;)