The smells are produced by machines uder seats at the back of the theater. Theater managers will need to pour a fragrant liquid into the machines that produce the smeels. Theater ticket to see a movie with smell-o-vision might be a little more expensive.
The idea of smelling a movie is not completely new . In the 1970s, theaters in united states gave each of the viewers a card as they entered . They could scratch the cards with their fingernails during scenes in the film to produce smells.