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The e-cigarette, which may very well be the most effective harm reduction device ever conceived to address preventable diseases, is built upon the simplest circuit possible. In essence, an e-cigarette is a resistor, a switch and a power source. From this simple circuit, thousands of variations arose over the course of about 15 years. During this Golden Age of regulatory limbo, the vapor industry exploded, and with that came endless innovation and constant refinement, transforming that little cig-a-like into all the products vapers enjoy today. Throughout this process, several innovations stand out as milestones. [...]