Depends on your definition of pen. As far as I'm concerned a pen style is the sort of thing that was being sold 8 - 10 years ago (DSE801 etc) these days it seems to be anything that isn't a box, cigalike, or epipe. Basically anything tubular that you can vape on. I've seen things that are chunkier than my UD Oak Leaf or TECC Odyssey tube mechs being described as vape pens. Surely these AIOs & the like are just regulated tube mods, not pens?
What is the current definition of a vape pen? Because I'm getting confused. I voted pen, because I don't like the shape of box mods, so everything I have that isn't an epipe is tube shaped. Am I wrong?
That said mod sure as hell doesn't mean the same as when the term was first coined.