Likely because as a cigarette smoker he doesn't see himself as a drug addict -- much like you don't see yourself, a vaper, as a drug addict. Self effacement.
Hmm, an apeal to popularity. We just "all know" what real drug addicts are like -- and they certainly aren't like us. Oh, no. They're smelly, live in filth and worthy of contempt. The fact is that there's drug addicts all around you and they act and look a myriad of different ways.
Don't confuse a drug's classification with being an addict. Just because a drug is restricted doesn't necessarily mean it's addictive. And vice versa.
Also, people become addicted to drugs prescribed by their doctors quite frequently. So, if you do become dependant upon it, yes, you would be an addict. And if you don't become dependant upon it, then no.
Ah yes, as long as we're dependant on the "allowed" drugs we're not really addicts. We're not those "typical addicts" -- we're better somehow. We get our drugs legally, so we're not really addicts in the "typical"
sense.
As for the video, yeah, the guy is failing to see the irony of his position -- much like yourself.