Black Gold
I know of someone in Tacoma, Wash. that actually brought a sample of "recon" (reconstituted oil left from BHO smoke collected from the nail/dome bong attachment for smoking/vaping BHO, or technically BHO resin) to a testing center just to see what was there and was blown away to find that it actually tested a bit higher in THC, and significantly higher in CBD than the original BHO had! Don't quote me for accuracy in the numbers but I believe it was something like 65% THC and 9% CBD as compared to 60% THC and only .5% CBD!!! I know this isn't your dad's 40 year old soapstone pipe resin I'm talkin about here but the results pose the question of what % of the psychoactive chemicals are left behind in typical pipe resin? I should have a test run myself but haven't gotten around to it yet. Curious though.
I do not currently save/smoke my resin because I am in the medical growing field and haven't run dry in years (well, I at least had trim around still to smoke or turn into hash) but I am not ashamed to say I have smoked the hell out of "pipe hash" in the past, and if deemed necessary will do so again in the future with no qualms about it, though the thick tarry smoke is quite nasty.
On another note I have determined the absolute best way to smoke resin is with the "hot knife" method, which includes 2 butter knives, a hot kitchen stove, and my own personal invention...the coke bottle ice funnel, or thingie as we call it. This is made by cutting a 20oz coke bottle in half, putting ice into the upside down top half, and sandwiching the ice with the bottom half placed upside down into the top half, making a funnel like device. I have tried several other brands/bottles and have deemed them all unworthy replacements of the 20oz coke bottle as they don't fit together and hold the ice in place as well, slight differences in size I guess. This apparatis greatly enhances the taste and overall experience of resin smoking to a level tolerable by almost any true stoner out there. So, next time you find yourself digging in your dirty pipe for that black gold, go to the kitchen and fire up the range with some knives placed in the element untill they begin to glow red, roll up the resin into tiny balls (to big is a waste, smaller is usually better) and call up your clan for some "resin knifers" and soon you will be pleasantly reflecting on how fortunate you where/are that you had this recycled material left from your "baller" days (ie last week).
-the only time I have blacked out due to a cannabis hit was actually from resin knifers, they pack a punch!