Two out of every three smokers in the United States try to quit. Some stop smoking abruptly—“cold turkey”—and suffer the unpleasant effects of nicotine withdrawal. Others choose nicotine replacement therapy in the form of a patch, gum, lozenge, or inhaler, attempting to wean themselves gradually from their nicotine addiction. Many combine pharmaceutical therapy with antismoking counseling. Unfortunately, few smokers—less than 3 percent—quit permanently. However, according to a research report in Lancet, an injectable nicotine vaccine will soon be available, and it could mean the end to nicotine addiction for even the heaviest smokers. Scientists at pharmaceutical companies in the United States and Great Britain have been working on a nicotine vaccine since the late 1990s, and several began clinical trials on human volunteers in 2001 and 2002. The new nicotine vaccine could reduce tobacco...