It's important that we complete the definitive studies and get scientific information.

I have been a Professor Emeritus since 1958, and have continued my scientific studies.

The bottom line is, when you look at the well-done scientific studies, there were very few showing that any of the cough and cold products that we often buy are in fact effective for the acute cough from the common cold. We're not saying there's no role for any of these products but, for the common cold, there are very few good studies showing that any of these drugs do work.

The take-home message is to never start smoking, and if you do smoke, to quit.

The rate of early cancer detection was better than what we see in the general community. But it remains to be seen if that translates into a mortality benefit. It is too early to make any recommendations regarding chest X-rays as a lung cancer screening tool in the general population.

There is no accepted early screening technique for lung cancer. The PLCO trial will show if chest X-rays, by catching lung cancer when it is still operable, can reduce the death rate from lung cancer.