PT 13 S2 Q15

Smokers of pipes or cigars run a distinctly lower risk to their health ... ...

Which one of the following, if true, offers the best prospects for an explanation of why the two changes in smoking habits do not both result in reduced health risks?
(A) Smokers of pipes or cigars who quit smoking thereby reduce their risk of smoking-related health problems.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Resolve/Explain" Questions, Set 2 - Difficult/Uncommon Mix (25Q)