Drug use (including religious, recreational, and abuse) was also a theme in many of Dick's works, such as "A Scanner Darkly" and "The Three Stigmata of Palmer Eldritch". Dick himself was a drug user for much of his life. According to a 1975 interview in "Rolling Stone", Dick wrote all of his books published before 1970 while on amphetamines. ""A Scanner Darkly" (1977) was the first complete novel I had written without speed", said Dick in the interview. He also experimented briefly with psychedelics, but wrote "The Three Stigmata of Palmer Eldritch" (1965), which "Rolling Stone" dubs "the classic LSD novel of all time", before he had ever tried them. Despite his heavy amphetamine use, however, Dick later said that doctors told him the amphetamines never actually affected him, that his liver had processed them before they reached his brain.