I didn't know about National No Smoking Day, though I have been trying to give up.
Something that I've noticed though and many non-smokers I know agree with this, is that the smoking ban has had a very harsh effect on English pubs.
It's by no means the only factor, but it is a major one.
If you feel like a short read, you may wish to visit:
Sky News - Pub Closures
There are many similar articles, but this seemed to be the most concise.
Another factor is of course, the relaxed licensing laws and cheaper alcohol sales in supermarkets, but many people who smoke now think that they may as well buy cans of beer or bottles of spirits and drink and smoke at home.
The smoking ban has not alleviated the burden on the NHS imposed by smokers, merely increased the number of admissions due to alcohol-related health issues - people will drink more when they are at home and measures of spirits are always much larger than those served in pubs and bars.
Stopping smoking is the choice of the individual - if they don't wish to do so, they won't.
The closure of pubs, partly due to the smoking ban, has resulted in higher unemployment and a greater burden on government resources when covering the costs of benefit payments. There were many debates over a possible partial smoking ban, or areas set aside for smokers, but these were dismissed almost out of hand.
Many believe that the "British Pub" will cease to exist within the next thirty years.
Not only will this destroy many livelihoods for brewers, delivery companies, landlords, bar staff, etc. but it will also remove a huge number of focal points in communities. These focal points and meeting places are an intrinsic part of British life and putting an end to them will also help to destroy "community spirit" - which helps to counter much of the anti-social behaviour that we are increasingly seeing.
I would argue that in order to maintain communities, preserve jobs and alleviate a portion of the burden on the NHS it would be wiser to "educate" smokers and let those who wish to continue, do so.
Create separate smoking areas in public buildings and overall, reverse the ban.