Smoke

All cigarettes are sold freely and are still relatively cheap by western standards.
Although many, if not most, Turkish people do smoke, there is a growing health awareness about smoking and the number of smokers is slowly but steadily declining, and the rigid smoking ban that was introduced is suprisingly enforced.
Smoking in the presence of someone who does not smoke in a public place requires their permission. If someone does not like the smoke, they will ask you not to smoke or they will cough, then just stop and apologize. This is what the locals do.
If you are invited to someone’s home, do not smoke unless the host does first, and after he/she does, then you can ask for his/her permission to smoke.
If you are in a place where people smoke, you can smoke, but if you are in place where no one is smoking, ask them first for their permission.
Smoking ban
Smoking is banned in public places (e.g. airports, metro stations and indoor train stations, schools, universities, government administration buildings, in all workplaces, concert halls, theatres and cinemas) and on public transport (airplanes, ferries, trains, suburban trains, subways, trams, buses, minibuses, and taxis). Smoking is banned in sports stadiums, the only outdoor areas where this ban is extended. It is a finable offence of 69 liras (~ €32, $45, £28). Separately smoking is also banned, in restaurants, bars, cafes, traditional teahouses, the remaining air-conditioned public places including department stores and shopping mall restaurants; and there are no exceptions as indoor non-smoking sections are also banned. Apart from a fine of 69 liras (~ €32, $45, £28) for smokers, there is a heavy fine of 5,000 liras (~€2,318, $3,260, £2,028) for owners, for failing to enforce the ban properly and that is why it is strictly enforced by these establishments.
In Istanbul, especially in non-tourist areas, some bars/restaurants/music venues and even work places will bring you an ashtray as there will be many people smoking inside, even though there is a sign on the wall forbidding it, many people consider it to be up to the discretion of the owners/workers of the building. However, bars/restaurants/music venues in tourist areas (eg. Beyoğlu, Sişli etc…) are relentlessy “raided” (and in case of any violations – not just for flouting the smoking ban – fined heavily) by the zabıta (municipal official), so these establishments will much less likely dare to violate the bans. Although such “raids” will be disconcerting for tourists, customers will not be affected as the zabıta does not issue fines to customers – at most will be asked to leave the place, in case of serious violations.
However the smoking ban is openly flouted in government administration buildings, where the civil servants seem to think that they are somehow above the law.
Outside the cities and tourist resorts, the smoking ban is less rigidly enforced in small towns and in the villages hardly at all, because the municipal police (zabıta) rarely comes to these places to enforce it and issue fines, leading to some establishments and its customers to ignore this, but even there it is nevertheless best to follow the less enforced smoking ban.
While smoking is strictly prohibited on public transport, you will see some taxi drivers smoking in their taxis, which are also included in the smoking ban, but is the only form of public transport where this ban is openly flouted. When entering the taxi just request the taxi driver not to smoke, and he will politely oblige – in fact most of them will put out their cigarettes immediately once they see a customer hailing them or approaching them.