The groups were nearly identical in most regards except for one crucial difference
Ghuniem MM, Khorshed MA, Souaya ER (2019) Method validation for direct determination of some trace and toxic elements in soft drinks by inductively coupled plasma mass spectrometry
Common materials include ceramic, cast iron, stainless steel, or crystal
A fully open airflow hole will dilute the vapour, cooling it down and increasing the size of the vapour cloud and while this may reduce the intensity of the vapour flavour, it also reduces the power required to heat the e-liquid, taking a bit of pressure off the internal battery
Reliable ignition and clean burn performance
Cover the exterior of your box in full color or print on the inside as well to showcase your brand