On Friday, we talked to three people who are trying to stop smoking - this morning on the programme we'll catch up with those trying to quit.
And we'll be following their progress over the coming weeks here on the website, with a special quitters' diary.
Professor Alan Marsh from the Policy Studies Institute. He's an expert on how much smoking costs us as country.
Professor Marsh said that calculations on how much smokers cost the country compared to how much revenue the government gets from cigarette taxes, could go on forever.
Looking simply at the cost/revenue figures, then smokers contribute more than they cost - the cost of treating them on the NHS for smoking-related diseases is less than the amount of money the government gets from taxes.
But Professor Marsh pointed out that this ignores the economic contributions that those people would have continued to make, if they had not become ill and died.
Then, if you carry on calculating purely on figures you need to take into account that those same people, because they're dead, are unable to collect their pensions.
Professor Marsh said that this sort of argument can go on forever - but what's really important is to formulate policies that save people's lives.
He says that taxing cigarettes highly works to the extent that it does deter some people from taking up smoking - particularly teenagers - because the cost is just so high.
But it does hit the poor hardest - because smoking is concentrated among lower income groups.
Why give up smoking? We all know in a vague way that smoking is bad for your health. But did you realise that half of all long-term smokers will eventually be killed by the habit?
Smokers face a higher risk than non-smokers for many diseases, from cervical cancer to angina. But the big three killers for smokers are lung cancer, coronary heart disease and chronic bronchitis and emphysaema.
Each year, around 120,000 people in this country die from smoking related diseases - and a quarter of those deaths are in middle age.
If you're still smoking in your thirties and forties, you're five times more likely to have a heart attack than a non-smoker.
You may have other reasons for giving up. If money is tight, remember that a twenty a day habit costs you around �35 a week - which could go very nicely towards buying a new outfit or having a good night out.
You might also find that other people don't appreciate the smell of smoke which comes with you wherever you go. Or they may not want to expose their children to your smoke.
How to give up
There are many different methods of giving up smoking, from hypnotism to nicotine patches, to willpower alone. Twelve million people in Britain have managed to give up, so remember - however bad it is - you're not alone.
The charity Quitline says it's helped two million people give up smoking in this country. It has a confidential telephone counselling service and also offers same day advice by e-mail.
You can also download a smoking diary from their website, which can help you keep tabs of what triggers your cravings for cigarettes.
The NHS also runs a smoking cessation service. It has a telephone helpline, which will refer you to local groups to help you give up smoking in your own area.
We have had several e-mails from local co-ordinators for this service, pointing out that it's completely free. They say the service works: around 50 per cent of users manage to give up for at least four weeks.
Quitline's phone number is 0800 00 22 00The NHS national smoking helpline will put you in touch with local services in your area: 0800 1690169. It is completely freeDo shock tactics work?
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In the end it will come down to willpower. If you really want to quit you will. 
Click here to see our studio interview with our three quitters, one week on 
