Beginning his final week as host of NBC's Tonight show, Jay Leno says that he has strived always to keep a level head. In a telephone interview with the Boston Herald , Leno remarked, "The real trick to show business is try not to get too excited. Try not to get too depressed. ... I have the same friends I had in high school. I'm married to the same woman I had. I'm still driving the same car I had when I dated her _ although I got a few more. I come in here and I enjoy it. I enjoy being a voyeur to show business. I enjoy looking at it and being around it. But it doesn't become my life. I don't let it absorb me."