Cipollone v. Liggett Group, Inc. is a landmark Supreme Court case from 1992 that addressed the issue of preemption in relation to state law and federal regulations concerning tobacco products. The case involved a lawsuit against cigarette manufacturers for failing to warn consumers about the health risks of smoking. The Court's ruling highlighted the complexities of express and implied preemption, particularly how federal laws can override state claims when it comes to product liability and consumer protection.