That all might be relevant, if it could be shown that the Bible is an unerringly accurate historical document.
Archaeological evidence on one hand, religious writings of vague date and provenance on the other. I know which I'd consider more reliable evidence of what was going on.
I wasn't going by the bible, I looked up a bit of history in general. The finding (I'm sure there's others) are that the Hebrews entered Cannanite lands about 1200 BC. It seemed odd to me that a Hebrew with strict dietary law would be using drugs, and also Hebrew law would have prohibited (even today maybe) the building of structures contrary to their religion. The structure shown would be a monument to a false religion to them. I don't think they allowed any outland shrines. As much as I can tell the only religious structures allowed were the temple at Jerusalem and the tent they kept with them in the desert. I'm thinking it's more likely the shrine may have been built by another religion as foreigners were allowed to live in in the territory. 
What gives you the idea that there was anything "outlaw" about this temple, and the two altars? What specifically would be "a monument to a false religion"? That doesn't make any sense to me. The archaeologists have said that it was a temple dedicated to the Hebrew god YHVH. No indication that there was any other god being paid honour there.
Do you have a source that tells us otherwise?
Perhaps you could point me to the section in the dietary laws in which cannabis is prohibited.
Frankincense is a well known offering, and was used in temples all across Eurasia. It was a valuable trade commodity. I don't know if you've ever burned incense like frankincense, but it doesn't actually burn on its own if it's being done properly. Ideally you use a clean smouldering base substance. Charcoal or dried dung will do nicely.
Cannabis also has been valued and used for millennia.
I think you've completely mistaken what this evidence indicates. As I mentioned previously, a 21st century American may think that there's something "unclean" about burning dung. It isn't necessarily the case that a Bronze age herder thinks the same thing. In fact we know that dung has been used by people for this purpose for millennia.
What we see here, leaving aside the gratuitous cultural colouring, is two altars. On one, the people offered up frankincense, on the other they offered up cannabis.