I'm going to assume that Marriott's "100 percent smoke-free" policy applies to Marriott Vacation Club. After all, the press release start off, "Marriott International, Inc. (NYSE: MAR) announced today that all of the Company’s lodging brands in the United States and Canada will become 100 percent smoke-free, beginning in September." (I added the bold attribute to the word "all" in this quote.)
However, I don't expect the policy to apply to patios, balconies, pool areas, walkways, or other outdoor areas. The press release lists various different indoor areas, but says nothing about outdoor areas. This means that you could sit down for breakfast on your balcony, only to find that the couple next door is sitting on their balcony for their morning cigarettes, and their smoke is drifting in your direction.
I don't think it's reasonable to ban smoking everywhere on the premises. Smokers can't go 7 days without smoking. Smoking is already banned in rental cars, most restaurants, and many attractions, so smokers need to smoke where they're staying. However, I think it is reasonable to limit smoking to areas where the smoke won't bother others. I could see designated smoking areas in gardens and gazebos around each property.
One issue that will need to be addressed is how Marriott will deal with guests who choose to ignore the rules. I was once greeted by the smell of stale cigarette smoke when I opened the door to our non-smoking Cypress Harbour unit. Fortunately, it was a time of year when we could keep the door to the screened porch open overnight, and that aired out the room sufficiently.
When checking into AmeriSuites, I've had to sign a paper saying I would be charged a specific, hefty cleaning fee if I smoked in the room.
Finally, let's not let this thread turn into a debate about smoking. Smokers know the health issues. And most smokers are courteous and follow the rules.