From nicotine gum to e-cigarettes, the global smoking cessation-aid market was worth around $2.4 billion in 2011, and as healthcare costs soar and more people seek to give up, its value is set to grow. But when it comes to kicking the habit, what will get people to quit – the carrot or the stick?

Once known as 'Europe's chimney', smoking is still a large part of French culture, with 47 billion French cigarettes lit up each year. In an attempt to combat the nation's nicotine addiction, France is raising the price of tobacco – opting for the stick over the carrot.

Whether it's Uber or the UK government, organisational use of behavioural 'nudging' is on the rise. But research shows some cultures aren’t as keen as others on having their behaviour changed in subtle ways, with factors like political views and socioeconomic status shaping preferences.

Changing social attitudes and a growing awareness of the negative health effects mean that smoking isn't cool anymore. Yet while 68% of smokers want to give up, just 3% manage to quit for good. Quit Genius is helping people break the habit by combining nicotine replacements with CBT via an app.