There is no scientific proof that cannabis use induces schizophrenia, Dutch scientists say, questioning recent research and an argument the Dutch government uses to crack down on marijuana selling "coffee shops."

In an article in this week's Magazine for Psychiatry, the three authors say that on the basis of currently available data "there is no justification for the proposed closure of coffee shops."

Subsequent Dutch governments have tightened rules on the sale of marijuana in government-regulated coffee shops, resulting in a significant reduction in the number of cannabis cafes. (CannabisCafes.com Ed.)