YT:

The United States alone spends some $40 billion each year on trying to eliminate the supply of drugs. It arrests 1.5m of its citizens each year for drug offenses, locking up half a million of them; tougher drug laws are the main reason why one in five black American men spend some time behind bars. In the developing world blood is being shed at an astonishing rate. In Mexico more than 800 policemen and soldiers have been killed since December 2006 (and the annual overall death toll is running at over 6,000)...far from reducing crime, prohibition has fostered gangsterism on a scale that the world has never seen before. According to the UNs perhaps inflated estimate, the illegal drug industry is worth some $320 billion a year. In the West it makes criminals of otherwise law-abiding citizens (the current American president could easily have ended up in prison for his youthful experiments with blow). It also makes drugs more dangerous: addicts buy heavily adulterated cocaine and heroin; many use dirty needles to inject themselves, spreading HIV; the wretches who succumb to crack or meth are outside the law, with only their pushers to treat them. But it is countries in the emerging world that pay most of the price. Even a relatively developed democracy such as Mexico now finds itself in a life-or-death struggle against gangsters. American officials, including a former drug tsar, have publicly worried about having a narco state as their neighbor.

Legalization would not only drive away the gangsters; it would transform drugs from a law-and-order problem into a public-health problem, which is how they ought to be treated. Governments would tax and regulate the drug trade, and use the funds raised (and the billions saved on law-enforcement) to educate the public about the risks of drug-taking and to treat addiction. The sale of drugs to minors should remain banned. Different drugs would command different levels of taxation and regulation. This system would be fiddly and imperfect, requiring constant monitoring and hard-to-measure trade-offs. Post-tax prices should be set at a level that would strike a balance between damping down use on the one hand, and discouraging a black market and the desperate acts of theft and prostitution to which addicts now resort to feed their habits.

There is no correlation between the harshness of drug laws and the incidence of drug-taking: citizens living under tough regimes (notably America but also Britain) take more drugs, not fewer. Embarrassed drug warriors blame this on alleged cultural differences, but even in fairly similar countries tough rules make little difference to the number of addicts: harsh Sweden and more liberal Norway have precisely the same addiction rates. Legalization might reduce both supply (pushers by definition push) and demand (part of that dangerous thrill would go). Nobody knows for certain. But it is hard to argue that sales of any product that is made cheaper, safer and more widely available would fall. Any honest proponent of legalization would be wise to assume that drug-taking as a whole would rise.

There are two main reasons for arguing that prohibition should be scrapped all the same. The first is one of liberal principle. Although some illegal drugs are extremely dangerous to some people, most are not especially harmful. (Tobacco is more addictive than virtually all of them.) Most consumers of illegal drugs, including cocaine and even heroin, take them only occasionally. They do so because they derive enjoyment from them (as they do from whiskey or a Marlboro Light). It is not the states job to stop them from doing so.

What about addiction? That is partly covered by this first argument, as the harm involved is primarily visited upon the user. But addiction can also inflict misery on the families and especially the children of any addict, and involves wider social costs. That is why discouraging and treating addiction should be the priority for drug policy. Hence the second argument: legalization offers the opportunity to deal with addiction properly.

By providing honest information about the health risks of different drugs, and pricing them accordingly, governments could steer consumers towards the least harmful ones. Prohibition has failed to prevent the proliferation of designer drugs, dreamed up in laboratories. Legalization might encourage legitimate drug companies to try to improve the stuff that people take. The resources gained from tax and saved on repression would allow governments to guarantee treatment to addicts—a way of making legalization more politically palatable. The success of developed countries in stopping people smoking tobacco, which is similarly subject to tax and regulation, provides grounds for hope.