What's the problem?
Substance X increases risk of Y whilst at the same time decreasing risk of Z. So?

Water increases risk of death by drowning, decreases risk of death from thirst. Is this evidence that either of these statements is wrong? No.

Yes, they are talking about 2 types of cancer, but is it plausible that something could decrease risk of a specific cancer whilst at the same time increasing your overall risk? Yes. No problem. Nothing to see here, move along.

Oh, but I don't want to imply at any point that journalistic standards in Science are at all high. They are, to put it mildly, bloody awful to the point of having a body count associated with them (MMR hoax, anyone?).
( Amish Information Systems hates misplaced, commas, Wed 25 Feb 2009, 13:00, Reply)