Actually I have to disagree with you on your representation of Analog vs Digital. By definition, a Digital signal is a series of 1's and 0's or On's (1's) and Off's (0's)
Just think of the Old Indian form of communication, Smoke Signals. It is a Digital form of communication using an Analog
device. Just like Light Signals on board a ship.
Thus
vaping is Digital in that they are either on or off. But old Cig's are analog as they are always on but with varying degrees of amplitude between taking a drag or sitting idle.
Just my 2 cents