Hi quitin, no such thing as a small milestone. Do you remember the first day you quit? The second? You made it through those days. Now you've made it 10 days. You can do another 10, and then another, etc.
I'm only on day two (I'm doing great) but I look up to and admire anyone who has been able to resist for longer than I have. You have inspired me. Hang in there!