The RELX product is for existing adult smokers and vapers only. It contains nicotine that is an addictive chemical and isn't recommended for people who are allergic to alcohols, cardiac patients, hypertensive patients, patients with respiratory diseases, pregnant women and lactating women.
RELX devices (Infinity, Essential and Classic) are 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 bottles, etc. It is resistant to high temperature and will not release harmful substances, thus you can use it without any worries.