I've tested it. I've been smoking weed straight, without any tobacco for over a year now. Recently, I decided I would try going 50/50, just for the hell of it. Simply put, I got VERY high, but it was a different high... It seemed like it went straight to my head, I was almost dizzy with the tobacco.

It's definitely different, so depending on my mood or what's available, sometimes I mix in tobacco and sometimes I don't.

If you don't believe me, try it for yourselves.