It's not a conspiracy, it's a well-documented effort by the US and other powerful nations to extort every corner of the planet to adopting harsh, unscientific, liberty-obliterating laws against drugs (except the state-sanctioned ones of course!) that has been going on for about a 100 years. Cracks are beginning to show (see Portugal, Uruguay and others), but that is still the global system we live under thanks to various UN conventions pushed by the US and the national-level laws that adhere to those conventions.