Another fellow JETS user... welcome. Just got mine a few days ago... and I daresay no complaints except maybe one!
Hope you have cleared your atomiser of the oil before using it!!!
Personally, I had left my cartridges in when not using... take out put in take out... errrr very leh chieh.
As for the Juices, mine are the 5ml type. I left them in the cabinet, and I notice a smell of the eJuice... to me, there is some evaporation of the
juice. As such, don't think it is wise to keep in fridge. Hahaha, later all your other stuff also have smell or worse. your meats and vegetables smell of your eJuice...
And for the complain... I notice that some mix will leave some juice on the tip. So please use the 'condom' provided. Depending on your mg level, prolonged exposure to the eJuice is not that good... errr I stand corrected though.