What is a pod system? Pods or ultra-portable devices are small discrete MTL (mouth to lung) devices that simulate smoking a cigarette and use higher strength nicotine salt e-liquid that ranges between 12mg to 60mg which allows you to get a decent nicotine hit without producing large vapour clouds. Simple to use pod devices come with disposable coil heads that come with liquid pre-filled or refillable coil heads that can be reused.