Makes no got damn frankinsense

The proof is that you will not find a half-way credible report of anybody using frankincense to get high. By that I mean you will probably find numerous reports of people smoking it together with another, proper drug, mostly cannabis. But even on the most hardcore "whatever, as long as it turns on somehow" pages it's not recommended. And all the publications go like it "may" do this and that, which usually is a misrepresentation of the actual scientific finding which mentions a similarity in molecular structure. Trust me: I've been systematically doing nearly every drug that's credibly reported to get you high and frankincense was never even recommended. Real drug fiends do belladonna ("deadly nightshade") and fly agaric mushrooms for hedonism, but not frankincense. Again, that excludes people who never really did any drugs, inhale some incense and start "feeling funny".

(German) scientific sources: Martinetz, D., Lohs, K., Janzen, J., Weihrauch und Myrrhe, WVG, Stuttgart 1988, 136-139.; Kessler, M., Zur Frage nach psychotropen Stoffen im Rauch von brennendem Gummiharz der Boswellia sacra. Inaugural-Dissertation, Basel 1991.; Pailer, M., et al., Über die Zusammensetzung des Pyrolysates von Weihrauch (1. bis 3. Mitt), Monatshefte für Chemie 112 (1981) 341-358, 595-603 und 987-1006.
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Oh, and what two german scientists found was that two potential ingredients of frankincese that may be used as base for a complete synthesis of thc, so not even a big simillarity in structure.

Thanks for the sources. I’ve never tried frankincense myself, and have just read many articles pertaining to the claim. What about the mixing of both resins as they burn? Is there any credibility to that?

Again, there is a fool-proof way to determine whether a substance can get you high: if people don't do it, it doesn't work.

But people DO do it. I know some personally that do. You know, I’m asking for actual sources here for the combination...no need to get snide about it...

I don't mean this condescending at all: how old are you and how old are these people you know doing it? You see, there's a lot of forums in the net dealing with mind altering substances, the well-known and the lesser well known. People who seriously try to get high don't do frankincense.
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As I said, I'm aware that people consume all sorts of things trying to get high, but the placebo effect is very strong in this area, and unless you have experienced an actual high from an actual drug, you're probably not the one to judge this type of things. Especially when science says "nope". And I mean actual scientific research, not what some media outlet makes of it. If you think that's snidely, it makes you sound whiny IMO.
Oh, and what about "sources [..] for the combination"... combination of what? And source to back up what exactly? Smoked too much incense?

Look, your words appear condescending, but I’ll just get over it. I’m 25, I know of older people in their 40’s that use myrrh and frankincense resin in a spiritual way, and claim to experience a high. That is what I was looking for with sources: burning and inhaling a combination of the aforementioned resins. I also know of a shop owner in his 60’s who is vet worldly that claims the same. So now you have that information.

Whenever I hear people saying they use stuff "in a spiritual way" I know for a 100% fact that stuff does nothing except stimulating their fantasy. I'm a drug fiend. I do drugs and I don't imagine their effect.
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As I said, there is no significant hint that myrrh and/or frankincense have an "effect comparable to marijuana" which is not saying it has none. The placebo effect wouldn't be a term if there was no (possible) effect. The main difference to what I would clumsily call a "proper drug" is that a placebo may or may not work, whereas a drug will work for almost anyone doing it.