[Researchers at the American Cancer Society compared the risk of dying among overweight people in two of its studies-one done from 1982 to 1991 and another from 1998 to 2002.] Instead of decreasing, ... the relative risk of dying among the overweight actually increased over time.
If you have a short follow-up, you still have a problem with people who don't know they're sick, ... As the follow-up lengthens, that's less of a problem because the people who don't know that they're sick die.
There was not a shred of evidence of reduced risk. The ultra light haven't been used as long as the light and it is possible that some difference in risk might emerge with longer term use of the ultra light, but this is very, very solid for the low tar.