While %s/drug/phone/g makes for an easy rhetorical trick, it also destroys a lot of essential context. It's also a bit on the offensive side if you or someone you know has dealt with actual drug addiction; as in, it cheapens it.
Picking some offenders from their list..
* You keep using your phone after it’s no longer needed to solve a problem. (Because nobody uses smartphones for fun?)
* You feel strange when you don’t have your phone. (I also feel strange when I don't have my watch, lighter, and multitool on me. This applies to all every day carry items.)
* You’ve begun having trouble doing normal daily things without your phone. (Normal daily things include responding to alerts, taking phone calls, and sending messages. I could not do my job without a smartphone, let alone a great deal of plain old human socializing. Further, IMs and SMSes are more respectful of my friends' time than phone calls which demand everybody drops what they're doing)
* You borrow money to pay for your phone. (Given the industry move to carrier financing rather than contract lock-in, I think most people now borrow money to pay for their phone)
* You drive or do other dangerous things (like use heavy machines) while you are on your phone. (People yammering on their phones in traffic has a lot more to do with a poor understanding of attention than it does this increasingly tenuous drug analogy. Besides, phone use while driving was a safety issue long before smartphones proliferated.)
* You hide some phone use or the effect it is having on you from others. (Only when the specter of Ludditism creeps through and I'd rather not be moralized to about my use of technology.)
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Let's not even talk about the bare equation of all games to addiction (seriously?).
If you feel you're addicted to your smartphone, by all means, do whatever works for you, but if you intend on presenting that to the world, please keep the crappy logic to a minimum.