Looks to me as if they didn't find a real cause, so they have made the assumption that it was a cigarette that caused the fire. I still don't believe that's a good assumption. Some other major combustible had to be involved.
🚢 Cruise with your favorite Keene Luxury Travel Staff Member! 💰 5% KLT Reward plus Shipboard Credit available (amount varies per voyage)! 💲 Offering Enhanced KLT Rewards on voyages hosted by Ngaire & Clay!