Puff count is the biggest culprit. Marketers love to claim '300 puffs per cartridge'—but that number is based on a standardized test that doesn't reflect real use. Nobody takes the same 3-second puff every time. The actual number can vary by 30% or more depending on your habits.

Cloud production is another overhyped spec. Big clouds look impressive, but they don't mean better vapor. In fact, huge clouds can indicate you're vaping at too high a temperature, which can degrade the flavor. For a discreet home session, a moderate cloud is fine.