RELX pods are built for puffing under normal drawing pressure. It may take a little extra suction on the first try to get the RELX pod working, but the following puffs should be gentle. Puffing too hard can force liquid up into the air path. It is best to avoid squeezing the mouthpiece between your teeth or lips - this pressure may also force liquid up into the air path and cause leakage. When inserting your RELX pod, place your fingers on the outer edges of the hard plastic mouthpiece to avoid squeezing the RELX pod as it clicks into place. If you're still having trouble, please contact the RELX global care team.
RELX Classic device is made of aluminum alloy with high strength and endurance. The shell material of cartridge is PCTG produced by Eastman in the US, which is mostly used to make aviation cups, milk bottle, etc. It is resistant to high temperature and will not release harmful substances, thus you can use it without any worries.