Johnson & Johnson (NYSE: JNJ ) is an iconic U.S. healthcare giant. It has changed over the years, but today its focus is on pharmaceuticals and medical devices. And it is an industry leader in both spaces. There are a lot of positives with J&J, as it is more commonly known on Wall Street, but there's one dark cloud that I can't ignore. And the shadow from that cloud is why I just can't justify buying Johnson & Johnson today.