Like cigarette manufacturers decades ago, e-cigarette makers have pitched their products as fun and safe. But nobody knows what the risks are.

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Health Risks of Vaping: Lessons From the Battle With Big Tobacco

E-cigarettes have been marketed for years as a cigarette substitute. But just how safe or useful they are is a debate taking on new urgency as scientists race to determine whether vaping may increase the severity of Covid-19. To understand e-cigarettes, Retro Report looks back to a time decades ago, when tobacco marketing fueled a health crisis of its own.