A lot depends on the device.New to vaping, ended up ordering eliquids with 18mgs, not sure what I was thinking, these are so strong, every puff I take, I end up coughing.
Also depends how you vape, DTL, MTL etc
I would start with a mild flavoured 6mg first to see how you get on.
NB most tobacco flavoured liquids are harsh and taste nothing like tobacco