I pondered the same question aloud with a friend who then said he heard Raspberry leaves have THC. So, being a highly experienced veteran at making honey hash oil I decided to get some butane and try it.
This was around November, so it was cold out. Fortunately in our yard we have a huge raspberry patch. I went out and gathered up any of the old leaves from the summer that hadn't fallen off. When I ran out of those I picked up as many as I could find on the ground. There was about a quarter pound of leaves. I then spent some time drying them out the rest of the way.
From there I proceeded to use the standard honey hash oil technique that I'd done so many times with butane. I ground up the leaves, loaded up my PVC pipe and proceeded to do a run.
The butane coming out the other end was yellowish and after a few seconds no more yellow so I stopped.
It took a few minutes for the extractant to dissipate in my warm water. The oil remaining was about 1/6 or so of what I'd get from typical cannabis 'trash'. However upon smoking it the taste and high were no different, albeit the oil was dryer than usual due to the season and oldness of the leaves.
If my oil production is expected to be low, what I like to do is take a bit of aluminum foil, and using a book or something I shape it around the object. Could be a bottle or whatever. But make sure the foil won't fall over in the water. A stable floating piece is what you need.
Leaving the foil in the warm water, do your run over this and everything will go on the foil. Which you can then cut up into pieces and smoke a little at a time right off the foil using a plastic tube while lighting the foil beneath.
For those fortunate enough to have lots of raspberries growing in the neighborhood, I found something which may be useful for economically getting the oil. Butane is to spendy. I'm going to try distillation. Found cheap ass kits here
http://www.crucible.org/lab_kits.htm If I remember to do it, I'll post an update on my results from this.
