IMO, that anti-smoking propaganda is pure bullshit. If heroin itself weren't illegal, could you imagine seeing the drug companies clamoring over themselves to put heroin in patches and telling addicts they can "wean" themselves off a "highly addictive" drug by taking diminishing doses, and making it available over the counter? Again IMO, it's the habit of the smoking ritual that's hard to break, not the physical dependence on the drug itself.
Actually it's both.