You know, I'd read about the horrendous injuries and seen the pictures, but it never occurred to me that a faulty e-cigarette could blind someone. That actually hits home to me more than the burns and corrosive gases do.
Are there any e-cigarette designs that use the cell to charge a large capacitor, which then dumps its charge into the coil, along the lines of the way a camera flash works? Capacitors are often able to handle much higher currents than cells.
You'd need a two-switch design - a latching "on" switch to let the capacitor charge, and a momentary "vape" switch to discharge it through the coil on demand - but it would have the advantage that only one puff's worth of charge would be dumped from the capacitor into something like a coil short, instead of the entire cell being discharged into it.
Capacitors do occasionally undergo catastrophic failures - poor quality electrolytic capacitors in power supplies are notorious for that - but they usually fail open-circuit when that happens, and again, there's a lot less energy in a single capacitor charge.
Would vapers want to inhale puffs of vapour too often for a capacitor charge cycle to keep up?