The war on drugs, good or bad??

This war on drugs has been going on in America sense the early 1900's, maybe longer. I know in the 1920's that illegal narcotics was a big problem though alcohol was the illegal drug most often remembered from that era. In the 1950's morphine started to get a major billing as an illegal drug because of former WW2 & Korean GI's that got addicted to it. In the 60's & 70's the feds & states were arresting folks left & right for illegal drug use. This war on drugs continues to this day. Excuse my ignorance on the subject, but WHO started this "war"? Do any of you reading this post know what it has cost taxpayers overall? I do NOT know the cost sense the wars conception so long ago but would imagine the cost for incarceration, surveillance, foreign operations, programs, legislation etc have cost the U.S. taxpayer hundreds of millions if not a billion or maybe more. Is not a persons body their OWN property? If so, why is using drugs illegal? Is this war even constitutionally legal?