Armed police swooped on a coach and shut down a motorway after a passenger spotted another person craftily smoking a fake cigarette into a bag and mistook it for a terror threat.u00a0After closing the road for more than four hours, police admitted the alert — which was treated like a major chemical incident — was sparked by a ‘health improvement aid for smokers’.

Chemical scare: A bomb squad approaches the Megabus coach on the M6 toll road after the passengers were evacuated.