Smoking refers the addiction to tobacco mainly caused by one of its active components: nicotine. This substance conditions tobacco abuse.
Tobacco causes diseases such as chronic bronchitis, pulmonary emphysema, and lung and pharyngeal cancer. It is also a major risk factor for cardiovascular disease since the incidence of coronary disease in smokers is three times greater than in the rest of the population. The chance of suffering from heart disease is proportional to the amount of cigarettes you smoke a day and the number of years you continue to have this bad habit.