Yup, I've done it twice (4 months or so ago), and it's not my thing so I didn't do it again. And yeah, it's not really an addicting drug at all and yeah it won't kill you, but remember this, don't let other people make you do something that you don't want to do. If your friend's do try to impose this on you constantly, then they aren't true friend's, because true friend's will respect your choices in life.