I am not sure if this has been posted on the site yet but I remember reading something similar about a month ago. Know your source, know what your lighting!! http://www.drugs-forum.com/forum/showthread.php?t=65051&highlight=glass
That was posted in July of 2008, hardly "urgent" at this point in time. Yes, you should always know what you are smoking.
I smoked oregano yesterday. My sister owed me a bowl, turns out she got ripped. I knew what it was after I hit it lol. Odd feeling oregano gives you.
Sorry it was on another info site....it could be hardly urgent unless a good quantity has made its way into the U.S. or people are starting to do this. What a shame.