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Overview of the eTop Puff Topography Instrument eTop (electronic cigarette puff topography instrument) is a compact research device designed to measure and record puffing behavior across a range of tobacco and nicotine products, including cigarettes, electronic cigarettes, heated tobacco products (HTPs), and waterpipes

Its bad enough that the tobacco industry is willing to kill its customers with a dangerous product

It's big enough for a satisfying personal session but not so massive that you're committed to a marathon

Bulk purchasing of refills often provides additional discounts, further reducing your per-unit costs