Baffled bystander films 'dancing and levitating' cigarette

A cigarette has become the subject of internet intrigue after a woman filmed it 'dancing and levitating' outside her workplace in Gateshead.The object appears to float in the air, swirling and swaying, without any apparent explanation. Online sleuths have chimed in with explanations to make sense of the 'mysterious' sight. What is your theory?