You are talking about people addicted to Coca-Cola. You can't just ask
them to plain stop drinking Coca-Cola, as long as you have some (and
even if you no longer have, it's still difficult). You can just say "If
you start drinking water, there may be some small amounts until you
fully switch to water". At least that's the idea. And it's suposed to
only be applied to small guys, since the big ones still have large
stocks to support the transition.