Unless i skipped over it, I saw no answer to your question… so I will have to do the honors. I had tried this in my earlier smoking days, and, well, let me be blunt. It was shit. it looked like shit, tatsted like shit, and didn’t do shit.
For a better review of it visit the link:
http://www.cannabisculture.com/articles/1526.html
I tried a bunch of them in my relative youth, including damiana, something called “marijuanilla” from Siberia, and a number of other pure herbs and mixtures. All came from a highly reputable company in Sebastopol, CA, now called The Botanical Preservation Corps. They also sell (sold?) a lot of the other lesser used hallucinogenic materials such as San Pedro cactus, ayahuasca vine, and even absinthe (the herb, not the extract). These, by the way, are NOT for the faint of heart, or intestinal tract.
None of the smoking mixtures did anything except induce some brief lightheadedness, probably due to the oxygen depletion inherent to inhaling the smoke from any burning vegetable matter into your lungs. Ended up tossing most of the stuff out.
A Google search will give you address for BPC.
I’ve never tried the stuff personally, but I’ve known plenty of people who have. Don’t waste your money bro. Trust me on this. Even if you buy an ounce and roll it up into a blunt the size of a duraflame log, it won’t get you as high as a hitter of schwag.
Inhaling the smoke of any burning material will cause some anoxia, thus making you feel “different”. One reason the companies that sell this stuff stay in business is that there are new potential customers all the time as kids age. Another reason is that some people mix this stuff with illegal herb in order to make more profit when they sell.