I think they may all go to this policy. Like Masaki said, it may have something to do with the fire on the Star Princess. Did the regulations just recently change. I noticed the reference on the Oceania website to the "newly enacted International Maritime Organization regulations governing fire safety", but that had to do with leaving personal belongings out on the verandas. Here is their smoking policy.

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What is the smoking policy of Oceania Cruises?

For the safety and security of all guests and staff onboard, Designated Smoking Areas are available on Deck 9, the forward starboard corner of the Pool Deck, and Deck 10, in the aft, port corner of Horizons. These areas are comfortably furnished and conveniently located near food and beverage areas.

Smoking is expressly forbidden in all Staterooms and Suites, on verandas, or in any areas of the ship other than officially Designated Smoking Areas. Smoking in a stateroom or suite or on a veranda represents a serious fire and safety hazard to all guests and staff. Guests choosing to disregard this policy will be disembarked at the next port of call and may also be subject to additional fees that will be imposed to cover the costs associated with any damage to and the required cleaning of furnishings, verandas and surrounding deck and accommodation areas.

All areas other than those specified as Designated Smoking Areas will remain smoke-free. This includes all guest suites and staterooms, verandas, restaurants, public areas, the Casino and all other areas of the ship. Cigar and Pipe smoking is only permitted on the forward starboard corner of the Pool Deck. In compliance with newly enacted International Maritime Organization regulations governing fire safety, we kindly ask that you refrain from leaving towels and other personal belongings on your veranda.

For your convenience, Stateroom Attendants will remove any personal items from your veranda during the course of their evening housekeeping duties and place them back in your Stateroom or Suite.