by law, a hotel can decide whether it has smoking/non-smoking rooms, or just some smoking-rooms and the rest non-smoking.
However, most of the hotels in spain enforce a strict non-smoking policy in all their rooms. It is very hard to find a smoking-allowed hotel in spain .
On http://www.booking.com/ you can choose for non smoking rooms.
When it says non smoking throughout then that is what it means.
When booking via the site you can request a non smoking room.
As pointed out above the law presently allows hotels to have a certain amount of rooms dedicated for smokers. The law is complicated so I will not go into it here.
My advice is try and find small hotels if you want totally non-smoking facilities. The way the law is written it is more than likely they cannot cater for smokers.
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