Whenever there is a great demand for a product and government makes it illegal, a black market always appears to supply the demand. The price of the product rises dramatically and the opportunity for huge profits is obvious. The criminal gangs love the situation, making millions. They kill other drug dealers, along with innocent people caught in the crossfire, to protect their territory. They corrupt police and courts.
Pushers sell adulterated dope and experimental drugs, causing injury and death.
And because drugs are illegal, their victims have no recourse. Of all drug users, a relative few are addicts who commit crimes daily to supply artificially expensive habits. They are the robbers, car thieves and burglars who make our homes and streets unsafe. An American Police State Civil liberties suffer. Your property can be seized without trial, if the police merely claim you got it with drug profits.