I hope someone who knows how to interpret statistics better than I will correct me if I am wrong (I very well may be) but the way I attempt to comprehend studies like this is to look at the rate numbers--i.e. cases per 100,000.
For example, according to this study:
for people who never used tobacco products, the rate of lung cancer is about 23 per 100,000.
For current pipe smokers, the rate of lung cancer is about 115 per 100,000.
For former pipe smokers, the rate of lung cancer is about 37 per 100,000.
You can put this information the way anti-tobacco people would, and say pipe smokers are over four times as likely to get lung cancer as never-smokers. Or you could put it the way I would: current pipe smokers have roughly a .12 percent chance of getting lung cancer, according to this study. Math people correct me if I am wrong.
You can look at the rates in this way with all the cancers and other illnesses listed.
I also think it's important to keep in mind that those rates for current and former pipe smokers include all-day smokers and smokers who inhale partially or deeply. In other words, for pipe smokers who don't inhale, or who smoke less, the rates will be lower than those listed above. Unfortunately they don't include rates, as far as I can see, with most of the charts, but you could figure out the rates for non-inhalers and moderate smokers if you looked at the numbers.
I also like to keep in mind that this data was collected from the early 1980s to 2000. Cancer rates change. For example, lung cancer rates for never-smokers have increased since then.
It's an interesting study. Thanks for posting it.