Problem is the war on drugs resulted in minimal damage to the actual drug dealers while overloading the prisons with non violent offenders. It also heavily targets marijuana over other drugs even though marijuana is significantly less dangerous than even legal ones like fucking alcohol.
It didn't accomplish any of its stated goals and only accomplished disrupting minority communities through the additional targeting they received (despite whites being just as likely to abuse drugs) and line the pockets of the for profit prison industry. It's one of the biggest wastes of tax payer dollars the US has ever seen.