According to a study authorized by the National Institute for Health and Clinical Excellence and carried out by the UK Centre for Tobacco Control Studies, reviewed published studies from 1990 and 2007, to establish success rates for the NHS smoking cessation services, chances of quitting smoking is influenced by external factors.

These external factors include, your environment, age and gender, either male or female, as the study revealed that older smokers have more tendencies than young smokers to successfully quit the habit,

Also, some men tend to experience more success in quitting than women, irrespective of the fact that most women participate in the smoking cessation services.

Meanwhile, the picture warning showing neck tumors and diseased lungs on the front of cigarette packets is reported to urge smokers into giving up smoking, as scientists have discovered that almost all the adult smokers in countries that are required to place the graphic health labels on tobacco products, noticed the warnings.

Over half of the smokers in 6 out of 14 countries in the study, stated that the warnings made them consider quitting.

Moreover, the CDC expects to have more research to attempt, revealing the amount of smokers who have thought about quitting due to the warning on the packet and apparently quit, as well as other factors that influences people to quit.