You can also use free-based E-Liquid on higher power pod system but it will not be as effective due to the low amount of nicotine. Another thing to note is PG/VG Ratio but this won't matter most of the time unless you are mixing your own E-Liquid or experiencing technical issues such as leaking.Pod System là m?t thi?t b? thu?c lá ?i?n t? nh? g?n,