Which of the following does NOT support the generalization (controlling idea) in "Smoking cigarettes is unhealthy"?

A、Studieshaveindicatedthatcigarettesmokingincreasestheriskofcancer.
B、Smokershaveahigherrateofrespiratorydiseases,suchasemphysemaandbronchitis.
C、Studieshavealsoshownthatcigarettesmokershaveahigherrateofheartattacks.
D、Moreover,cigarettesmokestainstheteeth.