We all know – or knew – one of these people. We can’t prove the job killed him or her, but there were all the signs. While we can never say precisely that a given person’s job contributed to his or her stroke or heart attack, it is indisputable that long or stressful jobs contribute to many people’s strokes and heart attacks. Smart employees recognize their mortality and set limits. Smart leaders make sure their employees leave work on time. It’s the topic of my latest Forbes column.