1. Your pee is carbonated
  2. You start rationalizing taking things out of the refrigerator to make more room for LC
    Suggested by @sloan
  3. You regularly wake up to find can/bottle collectors fighting over the contents of your recycling bin
    Suggested by @sloan
  4. If you find half a can of La Croix at a party you'll drink it... Even when you know it's not yours
    Seriously have done this.
  5. You start to like the Coconut/suntan lotion flavor.
    Suggested by @AlexandraLouise