A variety of plant materials are smoked, including marijuana and hashish , but the act is most commonly associated with tobacco as smoked in a cigarette , cigar , or pipe. The good news is that when you stop using tobacco, even after many years of use, you can greatly reduce your risk of developing head and neck cancer. Those who inhale when smoking are also at increased risk of getting lung cancer as well as heart disease, chronic bronchitis, chronic obstructive pulmonary disease , and emphysema. So their bodies can lack the nutrients needed to grow, develop, and fight off illness well. The good news is that within two years of stopping smoking, your risk of stroke is reduced to half that of a smoker and within five years it will be the same as a non-smoker.
Nicotine replacement products help some smokers quit. Some people worry about gaining weight if they quit. Typical symptoms of COPD include: increasing breathlessness when active, a persistent cough with phlegm and frequent chest infections. For example, the World Health Organization WHO estimated that in the late s there were approximately four million tobacco-caused deaths per year worldwide. The smoke produced when tobacco and these additives are burned consists of more than 4, chemical compounds.