Lol in a nutshell an rda is a "tank" in which you build your own coils, and opposed to there actually being a glass tank to fill up you have to refill the coils (drip) after every few hits. Benefit of rda vs a refillable tank is you can customize coil build for more flavor and cloud production (kinda like Android vs Apple).
Dripping and driving is generally not viewed as the safest activity. However I am guilty as well
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