Which begs the question as to whether the canabinoids are effective or the placebo effect is what is being observed.
It also brings up the question of why they didn't try an inhaled version rather than an oral version. Marijuana is known to have antiemetic benefits, for example, and delivering it via the lungs is both faster and avoids the problem of vomiting up the drug before it's absorbed. Pills are not the best way to deliver antiemetics; the leading anti-nausea drug (Ondansetron) is frequently delivered rectally or via IV. Delivery by inhalation has substantial advantages.
I really don't know why there aren't inhaled versions. I don't know if it's because research indicated that it wouldn't work, or if it's because it's so difficult to experiment on THC-derived compounds that nobody wanted to put forth the effort.
It is *not* the miracle drug that its proponents like to pretend it is, but it seems to be better than placebo for various indications and has the advantage of being cheap. And it would be readily available, were it not for laws preventing that. Since it appears to be no more dangerous than other commonly-available drugs, I don't see why it remains a Schedule I drug.