Someone explain to me

[VapingBoy]

This has been bothering me for a while so I thought I'd ask here, among the learned members

As I understand things, the FDA want to have e-cigs classified as 'drug delivery devices' as opposed to 'tobacco' or 'tobacco alternatives'. Hopefully I've understood that much correctly.
The thing I don't understand is; what then, are cigarettes?
They cannot NOT be a drug delivery device as to my mind that is their SOLE function. A cigarette was designed to burn tobacco leaves to deliver nicotine to the user, correct? Which makes it a device designed to deliver a drug. That's all it does. It has no other use.
Unlike an ecig which has the option of NOT delivering nicotine if the user so chooses.

So..how is a cigarette defined differently? To my way of thinking it is MORE of a 'drug delivery device' than an e-cig is...

Am I misunderstanding something here