Remember at the moment there has been no official press release from Alton Towers, it's just a snippet on Screamscape. Though there is a reference on the Alton Towers website, in the corporate sections faq's regarding designated smoking areas.
Most venues we use for our events are non smoking. Do you allow smoking at your venues?
Due to new legislation smoking is not allowed in any of our venues. Guests wishing to smoke must use dedicated smoking areas in the theme park. If you are using the Corporate Hospitality Suite guests can use the private patio area.
If it is true, be interesting to see how they enforce it, as they can't enforce the no smoking in queue lines policy.
Also, doesn't Legoland have a no smoking policy covering the entire park??