I believe this chart will be of use to you.
I used to wonder why they even bothered to have "No smoking" signs, but now I realise - Air Algeria, Cubana, Garuda, Iran Air and more still allow smoking in certain sections.
The chart is quite old, but my friend flew Cubana at the end of 2010 and confirmed that there was smoking onboard his flight then.
According to Answers.com : 1979: Cigars and Pipes banned on aircraft 1988:
Smoking banned on US Domestic flights under 2 hours 1990:
Smoking banned on US Domestic flights under 6 hours 1998:
Smoking banned on all US Domestic flights 2000: Federal law introduced banning smoking on all flights by US airlines.
I can't seem to find any information about when it was banned in the UK, other than the mid 1990s.
There is no overall law or treaty that bans smoking on all international flights.
See related links for information about which countries (most of them) have banned smoking on aircraft departing from their airports.
The Framework Convention on Tobacco Control (FCTC) is the world's first public health treaty.
The FCTC entered into force on 27 February 2005.
The FCTC contains different measures designed to reduce the devastating impact of tobacco on health and economics.
As of January 2009, 168 countries have signed the treaty, and 161 countries have ratified the treaty, becoming Parties to the FCTC.
Nosmoke.org recognises that 2010 marked the 20 year Anniversary of smokefree U.S. domestic flights, and the ten year anniversary of smokefree flights in and out of the United States.
And according to the New York Times , smoking was ALWAYS permitted on the Concorde.
In addition, several flyertalk forums refer to attempts to start smokers-only airlines, although these ideas seem to largely have been all hot air, gone up in smoke, or flamed out...
travel.stackexchange.com/users/101/Mark Mayo
Even if the airline permits it, local airspace laws may not.
For example, Australian federal law makes it a criminal offence to smoke in any aircraft while flying in or through Australian airspace.
It is also a criminal offence to disregard an instruction from flight crew (such as being asked to not to smoke or use an nicotine inhaler or electronic cigarette).
You may find your one act ends up breaking several laws.
In addition, some countries have treaties which ban smoking on flights between those two countries.
Again for example, it is illegal to smoke at any time on any flight between Australia and the United States, and if you do you may find law enforcement waiting for you at your destination.
travel.stackexchange.com/users/6811/Mark Micallef
For me as a flight attendant, my biggest concerns is not about the cigarette.
But the smoke.
Fire is on the top of the hazard list.
And we identify it by the smoke (and the scent).
We are trained to spot smoke, identify the source and to drop everything to handle it immediately.
So its not about the nicotine I just have to say it again one more time, any kind of smoke requires the crew to check and ensure that its not a hazard.
Fire is a life threatening hazard that can be identify by the smoke.
So forbidding e-cigarettes is not about the nicotine.
Its about the smoke you will produce :) Edit:I just found out about smokeless cigarette...
To be honest, I have no idea about this one.
I imagine if one passenger told me about it
I wouldn't know what to do to keep the policy on.
travel.stackexchange.com/users/39403/egotopia
An e-mail from IATA revealed that not a single IATA airline allows smoking any longer.
The last one to allow it, Cubana, banned it in 2014.
travel.stackexchange.com/users/39782/Crazydre
EDIT:
The quoted article dates back 2009.
As e-cigarettes become more popular, this answer may be less acurate.
Electronic cigarette might be an option on some non-smoking non-US flights.
The best is to ask to cabin members :
Flight attendant: Would you like something to drink?
Me:
Yes, I would like apple juice, and may I ask you a question?
Flight attendant:
Sure Me: Is it OK if I use my nicotine inhaler on the plane?
[I then show them my pen-style e cig]
Flight attendant:
Nicotine inhaler?
I don’t know.
What is that?
Me: It’s a source of nicotine for smokers similar to nicotine gum or the nicotine patch.
It is completely legal on airplanes and not affected by smoking bans, but I always ask because sometimes when I exhale a mist may come out of my nose and mouth
and I don’t want other people to think that I am smoking.
The mist is just water vapor that delivers nicotine to my lungs.
May I show you what I am talking about?
travel.stackexchange.com/users/241/mouviciel
Do any airlines still allow smoking on-board international flights, or is this something that has been banned across the board everywhere? If this is because of fire hazard regulations, what about  e-cigarettes ?
Are there any airlines that still allow smoking on-board flights?
travel.stackexchange.com
<air-travel><airlines><health><safety><smoking>
travel.stackexchange.com/questions/5224
travel.stackexchange.com/users/108/Ankur Banerjee
There is no overall law or treaty that bans smoking on all  international flights, but local airspace laws may not permit it and some countries have treaties banning smoking on flights between those two countries. An e-mail from IATA revealed that not a single IATA airline allows smoking any longer. Air Algeria, Cubana, Garuda, Iran Air and more still allowed smoking in certain sections until recently, and smoking was always permitted on Concorde. The latest information states that no airlines now allow smoking. Cubana was the last airline to ban smoking in 2014. However, smoking was apparently always allowed on Concorde.
It seems that some airlines were reticent in banning smoking and smokingwas allowed on Concorde. Latest information states smokingis banned on all airlines. It is also banned by treatise between countries. Cubana was the last airline to ban smoking in 2014.