Dwight Howard is brushing off an explosive accusation his estranged wife made in a wild rant over the weekend ... claiming he's never done cocaine a day in his life. The former NBA star broke his silence on the claims Amber Howard made in a viral video, where she appears to be holding a bag of white powder, alleging that Dwight has a severe cocaine addiction. "I tried to tell everybody he needs some help," Amber cried in the video. "Nobody wanna f***ing listen because he got the money." It took