Guardian Unlimited | Life | Better night vision through cannabis

"We knew it gave people the munchies and made them giggle. Now researchers claim to have found a new property in cannabis - it helps us see in the dark."

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But their results backed up claims by the Observer columnist Sue Arnold, who suffers from retinitis pigmentosa and is officially registered blind. She noticed several years ago that drawing on strong Jamaican skunk suddenly and temporarily enabled her to see things clearly.

But Ms Arnold has since warned of side-effects that could impede night-time navigation.

"Only trouble was," she said, "I couldn't stand up."