Smokers are often short on energy and get out of breath quickly. Tar sticks to the windpipe and the inside of the lungs. This makes it more difficult for your lungs to work efficiently and more difficult to breathe. What's more, tar can actually damage the walls of your lungs and cause cancer. Many serious diseases are caused by smoking, including heart disease, lung cancer, bronchitis and stomach ulcers.
Smoking is also bad news for people with asthma.
Smoking not only triggers asthma attacks, but it can permanently damage your airways. Take heart - with a little effort you can give up. Not everyone succeeds first time around so don't feel guilty - take a break and when you're ready, try again. Don't give up trying and don't be afraid to ask for help. It's a myth that smoking keeps you slim.