it will cause a serious problem because of its side effect like hallucination
Marijuana is not a hallucinogen... stop with the uninformed propaganda
Conspiracy theories are clever, however this one as a single major flaw.
The legalization of marijuana is a decision that's VOTED ON BY THE PEOPLE!
So it's not the government that's deciding to legalize the drug, it's the community. So unless the community is trying to dumb themselves for the purpose of suppressing mutiny, which is highly unlikely, the reason marijuana is becoming legal is because people want to be able to smoke weed without criminal consequence.
The government is the one with the conspiracy... they are keeping marijuana illegal, and in schedule 1, against all evidence... it's a conspiracy to keep the drug illegal because cops... cops "smell marijuana", and can then search a vehicle/person without probable cause
Half of the people in American prisons are there for marijuana (private, for-profit prisons)
$Billions$ of dollars are seized every year as "drug money"... even when there is zero evidence of such:
http://www.cnn.com/2015/01/21/us/asset-seizures/https://priceonomics.com/how-police-officers-seize-cash-from-innocent/in 2010, government seized $2.5 billion in assets from criminals and innocent owners by forfeiture methods