The 23-year-old, who rose to fame after playing the lead character in the 'Harry Potter' franchise, makes it a point to take a quick drag during the shooting, currently on in Canada, to reduce the stress, reported Daily Mail online.
On a recent such break, he was joined by his co-star actress Juno Temple for a chat.
"Horn" is a horror movie, based on a Joe Hill's novel of the same name. Directed by Alexandre Aja, the movie will have Radcliffe play the lead role of Ig.