Some of the health benefits to be gained by giving up smoking:

Becoming Smoke Free has immediate health benefits such as a lower heart rate, improved carbon monoxide levels and a better sense of taste and smell. Within weeks improvements can be experienced in coughing, breathing and lung function. For those who have asthma, after stopping smoking for a few weeks the severity of asthma attacks reduce. Within a year, stopping smoking can result in improvements for people with mild to moderate Chronic Obstructive Pulmonary Disease (COPD) and reduce the risk coronary heart disease by 50%!