Smoking cessation drugs like Nicoderm & Nicoderm CQ as well as Zyban & Wellbutrin have been linked to deaths......Deaths have occurred due to heart attacks for those using nicoderm patches ............
And the smoking cessation drug Zyban is dangerous, perhaps fatal, to your health.
Deaths due to anti-smoking drug Wellbutrin are documented here.
Update: A reader points out a serious health hazard for those with Crohn's disease who quit smoking. See Lcomeno's comment here.