Drug laws are enforced unequally. Sons of presidents, congressmen, senators, and other high profile citizens often get off with a warning. Commoners, especially blacks and Hispanics, go to prison. Drug sellers often do more time than rapists. Sale and use of drugs among consenting adults does not involve the use of force against person or property.
Many folks use drugs recreationally for awhile without apparant harm.
For these reasons, drug use and drug selling is not the sort of activity that meets many people's the definition of crime. Laws which punish non-coercive acts breed contempt for the law. No-knock searches, often based on an anonymous tip, have led to raids on the wrong houses, with loss of privacy, and sometimes loss of innocent life. Property confiscation in drug-related cases has become so lucrative for police agencies that real crimes sometimes must take a back seat to drug enforcement. Our prisons are so full of drug offenders that real criminals are often allowed to plea bargain or get early release to relieve prison overcrowding.