RESUMO
Three erroneous assumptions have influenced illicit drug abuse control policy. The first states that dependence-producing drugs are not different from many other substances consumed by people. This assumption underestimates the inherent neuro-behavioural properties of dependence-producing drugs that lead their users to adopt a compulsive pattern of daily consumption that is damaging to health. The second assumption states that even a young person may learn to use these drugs in a reasonable and responsible fashion, taking advantage of their redeeming qualities and avoiding their damaging effects. This assumption overestimates the ability of the human neocortex (new brain) to override the chemical stimuli induced by dependence-producing drugs in the pleasure and reward centres, which seem to be located in the limbic system of the old primitive brain. The third assumption states that social acceptance and commercial availability of illicit drugs would eliminate the social costs associated with their illegal traffic, which breeds crime and corruption. This assumption ignores historical precedents and the results of epidemiological surveys that demonstrate the damaging effects that social acceptance of these drugs and their widespread use may have on the individual and society. Surveys of drug consumers indicate that the percentage of addicts is significantly related to the dependence-producing potential of the drug used. In a population where alcohol is commonly consumed, 7-9 per cent of the consumers drink in amounts that are damaging to health. In a population where cannabis is socially accepted and easily available, more than half of cannabis consumers use the drugs in doses damaging to health. Approximately 90-95 per cent of cocaine or heroin users consume their drug of choice on a daily basis. Therefore, the dependence-producing potential of cannabis and that of cocaine or heroin would be, respectively, 7 and 14 times greater than the dependence potential of alcohol. Current illicit drug control policy should be based on scientific evidence and successful historical precedents, some of which are summarized in this article. This policy should concurrently aim at curtailing the supply of illicit drugs and reducing their demand.
