The director Kiran Rao (centre) arrives with cast members (left to right) Kriti Malhotra, Prateik Babbar, Aamir Khan and Monica Dogra for the premiere of his film Dhobi Ghat at the Toronto International Film Festival in Toronto on Friday September 10, 2010. THE CANADIAN PRESS/Chris Young Lucknow: Actor Prateik Babbar, who battled substance abuse in 2013,...