Smoking causes health problems:

1 - Smoking increases the risk of several cancers, lung cancer remains the most common but also increases the risk of other cancers such as cancer of the throat, mouth, larynx, esophagus, pancreas, kidney, bladder, cervix, stomach and leukemia, or cancer of the blood.
2 - Increased risk of serious lung problems such as emphysema, chronic bronchitis, bronchitis and pneumonia.
3 - Health problems in the heart and arteries as aortic aneurysms, atherosclerosis or hardening and narrowing of the arteries and increases the body's tendency to form blood clots.
4 - People who smoke may develop periodontal disease (gum disease), bad breath, stain teeth.
5 - Increases the risk of cataracts.
6 - Can cause stomach ulcers.
Smiling is beneficial to health:

The smile is essential for humans, and so important that causes various changes in the body:
In the muscular system: the fabric is relaxed and the tension is released. To laugh also burn calories: 20 seconds of laughter to laugh, equivalent to perform three minutes of any aerobic exercise.
The immune system and endocrine changes also present: a smile, encourages the hypothalamus to release endorphins and produces an analgesic effect on the body. adrenaline, also secreted by the brain, causes alertness and vitality.
It is proven that laughter decreases cortisol in the body, one of the causes of stress hormones, and increases the activity of lymphocytes, responsible for a good immune response.
In conclusion, people sad and too serious is much more susceptible to various diseases, compared with cheerful people. Laughter raises self-esteem and confidence, because it eliminates the negative thoughts and feelings of fear.
Jenifer Mazzoli.