Cigarette junkies in Glasgow, Scotland who went to the doctor recently to get a prescription to help them stop smoking got a little — or big, depending — surprise instead.

Doctors in the UK use a sophisticated computer system to print prescriptions that recommend cheaper generic alternatives. So when the docs prescribed Zyban for the smokers, the computer substituted it for…. the generic form of Viagra!

“If the urge to quit smoking lasts for more than four hours, see your doctor.”