Singer Robin Thicke is convinced he has spent more than $500,000 (£333,333) on marijuana. The pop star, who was arrested in New York City on a pot possession charge last year (12), has revealed his habit has cost him a fortune, and he has been trying to give up. He tells Britain's The Sun, "I do smoke. I do everything I'm not supposed to do. Weed is my crutch, my muse, the lesser of all evil. I've spent a good $500,000 on pot. I've tried to quit smoking. I've quit everything once. My buddy runs a store, I can get medical marijuana. When I'm at home, I'm a non-stop chimney." The Blurred Lines star was detained by police last year (12) when he was spotted smoking what appeared to be a joint while sitting in a car in Manhattan.