The preform looks kind of like a test tube, with threads at its mouth and a disc-like collar just below
However, such a way has significant drawbacks: when smoking, the perforation may be accidently closed, for instance, when the cigarette is pressed by lips or fingers
After smoking this can be a very odd way of getting your nicotine hit as the vapour is drawn directly into your lungs rather than into the mouth first, like you would smoke a cigarette

Pros Use Temperature Control mode for maximum power precision Youre free to opt for kanthal or stainless steel pods At reasonable outputs, you can vape for up to 6 days Hit the adjustment dial three times to lock the kit Cons The adjustment dial is fiddly You dont get the option to change your coils, just the pods The adjustable airflow slider should open wider for bigger lungfuls Geekvape Aegis Legend 5 An (almost) indestructible dual-battery cloud beast built to withstand the harshest conditions Why We Recommend It for Heavy Smokers IP68 certification means its shockproof, waterproof, and dustproof Dual 18650 batteries are user-replaceable, avoiding the cost of replacing entire mods 200W maximum output provides ample power for sub-ohm cloud chasing Heavy smoking requires a heavy-duty device that can withstand extensive use and a rough and tumble lifestyle
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It has adjustable power levels that allow for incredible flavour production and a decent battery capacity of 1000mAh that can power 6+ hours of heavy vaping on a single charge