[MarkusWandel]

I've never smoked but I used to date someone who did.

Part of what makes it so addictive is that it's a social activity. With smoking having been marginalized to zones ever further away from buildings - for example, not even on hospital grounds any more, never mind the buildings - the smoker areas tend to be little social hubs. Quit, and you lose that cameraderie. You can get over the nicotine dependency in less than one (unpleasant) week but what is harder to quit is the ritual.

If you don't count the smartphone interaction itself as cameraderie, then the problem with these things is actually the opposite! Instead of marginalized people engaging in real social interaction, you now have social interaction banished e.g. even from restaurant tables as everyone is busy with their little addicto-gadget.