Mark Ronson hasn't touched a hard drug in years, but in his new memoir, the music producer regretfully admits to having one too many close calls when he was younger. "One night, when I was out late and already flying on E [ecstasy], I took a bump of coke," Ronson, 50, recalls in Night People: How to Be a DJ in '90s New York City (out Tuesday, September 16). "Within minutes, my chest tightened and my left arm went numb. Could I be having a stroke? At twenty?" Ronson remembers "trembling, waiting for the panic to pass, but it wouldn't let up.