I wish I knew somewhere to buy good kanna. I've bought kanna twice now and it wasn't very good it was brown and I suspect kind of old.
I've tried some homegrown kanna a couple times it was much better. A friend of mine grew it. He fermented only the leaves so the plant would still live. He said he fermented it for a week then dried it in his oven. What he ended up with was green stuff that smelled like cucumber salsa. It was very potent.
We smoked it in 50/50 combination with some good buds and the kanna seemed stronger than the weed. It gave a pleasant euphoric high. I was a little more sociable than usual after smoking it.
My friend left me with a little bit. A couple days later I got the idea to try taking a hit of it from a waterfall made from a 20oz bottle. That was a bad idea. Right after I blew the hit out I threw up (something I never do after taking gravity hits), my pupils got huge like I was tripping, i felt very shaky, I was covered in chill bumps, and sweating profusely at the same time. This lasted for five minutes after that I just felt really high. I'm pretty sure I was experiencing serotonin syndrome for a couple minutes there. So if you ever find some really strong kanna don't ever try smoking it out of a waterfall or gravity bong it's asking for an unpleasant and in all likelihood very dangerous experience.
All that being said smoking small amounts of it was very pleasant. It's nothing I would do regularly, but I wish I knew where to buy some high quality kanna to do on special occasions. If anyone knows a good source please PM me.