In TOS, Leonard Nimoy had a wonderful voice. In TMP, his voice seemed much deeper but less interesting and less lovely. Does anyone know what happened? I know that he smoked during the TOS era and didn't give it up until he started directing. And I know he drank heavily for awhile. Is the change in his voice just the effects of smoking and drinking, or did he suffer some sort of injury to his voice? Does anyone know? I've read both of his autobiographies and didn't see any mention of vocal training or vocal injury, but I haven't seen all that many interviews with him, since I lived in a TV-free household for a couple of decades.