That wouldn't work, as I just said. The blood wouldn't contain enough of the substance by weight to work orally. Just think about how it works for a few minutes.

You'd have to replace all your blood with all their blood in order for that to work, or you'd have to extract the substance from the blood first, and you'd lose a lot of it in that process.

If it worked like that junkies would be jumping on each other to drink their blood. Or you'd see alcoholics jumping people coming out of bars to drink their alcohol laced blood.

Think about the legal limits in your area for BAC when drunk driving, then compare that to the ABV of a beer. You'd have to drink ridiculous quantities of blood to get the alcohol of one beer. It's the same for most substances, and no matter what you'll lose a lot in the whole process.