From The Independent of London:
Tony Blair is planning a controversial U-turn on cannabis laws and the reintroduction of tough penalties after an official government review found a definitive link between use of the drug and mental illness. […]
[T]he Advisory Council on the Misuse of Drugs (ACMD) has detailed evidence showing cannabis triggers psychosis in regular users. The findings are expected be used by Mr Blair to overturn the decision made two years ago to downgrade the drug.
Article here. No word on whether the study confirmed a definitive link between long-term governance and incurable jackassery.
Speaking of Euro-skunk, Czech friends tell me that when the government moderately tightened the generally loose possession laws not long ago, Czechs just shrugged and began smoking it even more openly than usual in bars and clubs. After the mocking civil disobedience, the government is now looking to climb back down.