It’s all about the heat released from the coil to aerosolize the eliquid. Ohm’s law tells you that current increases with lower resistance (with costant voltage) and with higher voltage (constant resistance). For many reasons, coils with lower resistances are used to increase the current and increase the vapor produced as opposed to increasing voltage.
ELI5 explanation: lower resistance = more electricity can pass through = more power = more vapour
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