Hooked on hash

The question of whether marijuana is physically addictive has been troubling researchers for years--but the latest evidence suggests that lab monkeys, at least, are easily hooked.

For the first time, scientists in the US have shown that monkeys will seek out the active chemical in cannabis just as they would with cocaine or morphine. The finding has created an uproar over the implications for humans who smoke pot.

Therapists and psychiatrists who treat marijuana dependency are convinced the study will persuade people to take pot"s potential for abuse more seriously.

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