These 8 devices are what I am using now.
Pen style DTL, Pen style MTL
Box mod, POD system, All in one system.
As a 10 years' real smoker, i prefer higher Nicotine e liquid(20 to 30mg).Also nic-salt is fine.
DTL is not my favor, but sometimes I like to make huge vapour.
Anyway, it help me quit smoking and live a heathier life.