Yes, we routinely recover the resin from our oil pipes and I have recovered the resin from a bud pipe. Recovery from a bud pipe takes extra work to clean it up so that it doesn't taste like an ash tray, and it may still contain the cacogenic byproducts created by pyrolysis.
What I did was dissolve the resin in denatured alcohol and then mix with hexane and salt water, before separating in a separatory funnel, and evaporating away the hexane.
It produced a light yellow resin, which I had to redissolve again in denatured and filter through activated charcoal to get rid of all the ashtray flavor.
A fun experiment, but I don't recommend smoking anything because of the free radicals that are created, and reclaiming it to burn it again, only concentrates them.
Here is more information on how we did it:
To put this process into perspective, I once collected all of my pipe bowl scrapings and roaches until I had about a pint of them, and dumped that into the container of black denatured alcohol, that I had been cleaning my pipes in.
I shook the mixture well and let it soak for a day to extract the material from the roaches and scrapings, before straining it through a wire strainer and then a coffee filter.
Because I didn’t want to mess up a separatory funnel with the black foul smelling mess, I poured the solution in a 1 gallon Ziploc bag, to which I added equal amounts of water and hexane.
After shaking it well, I hung it from one corner, to let it stratify, and after it had, I clipped off the lower corner of the Ziploc bag, and by pinching it, and controlling the bleed rate, I was able to bleed off the water, alcohol, and emulsion layer, so that only the now gold hexane solution remained.
I filtered the hexane and poured that into a Pyrex pie plate, which I blew air over with a fan to evaporate off. Attached are pictures of the amber oil that I extracted.
While the black color was gone, slight ashtray undertones could still be tasted, so further refining was necessary with activated charcoal, but we will cover that as a separate subject.
I am not suggesting this process for reclaiming ashtrays, but simply to make a point.
Taken from:http://skunkpharmresearch.com/getting-the-green-and-waxes-out-afterwards/