Excellent point. I'm not sure how "fixed" the correlation is for alcohol though. Someone who almost never drinks will be quite impaired at 1‰ BAC, whereas someone who drinks several times a week might not be affected that much. Of course this variation is comparatively small. When it comes to THC, individual resistance really differs by orders of magnitude. Seems the body can adapt to psychoactive agents more easily than to cytotoxins such as alcohol.
