Cigarette smoking

What is Cigarette smoking?

Tobacco smoking is the practice of burning tobacco and inhaling the smoke (consisting of particle and gaseous phases). (A more broad definition may include simply taking tobacco smoke into the mouth, and then releasing it, as is done by some with tobacco pipes and cigars.) The practice was believed to begin as early as 5000–3000 BC . Tobacco was introduced to Eurasia in the late 17th century where it followed common trade routes. The practice encountered criticism from its first import into the Western world onwards, but embedded itself in certain strata of a number of societies before becoming widespread upon the introduction of automated cigarette-rolling apparatus.

German scientists identified a link between smoking and lung cancer in the late 1920s, leading to the first anti-smoking campaign in modern history, albeit one truncated by the collapse of the Third Reich at the end of the Second World War. In 1950, British researchers demonstrated a clear relationship between smoking and cancer. Evidence continued to mount in the 1980s, which prompted political action against the practice. Rates of consumption since 1965 in the developed world have either peaked or declined. However, they continue to climb in the developing world.

Smoking is the most common method of consuming tobacco, and tobacco is the most common substance smoked. The agricultural product is often mixed with additives and then combusted. The resulting smoke is then inhaled and the active substances absorbed through the alveoli in the lungs. Combustion was traditionally enhanced by addition of potassium or other nitrates. Many substances in cigarette smoke trigger chemical reactions in nerve endings, which heighten heart rate, alertness, and reaction time, among other things. Dopamine and endorphins are released, which are often associated with pleasure.

Many smokers begin during adolescence or early adulthood. During the early stages, a combination of perceived pleasure acting as positive reinforcement and desire to respond to social peer pressure may offset the unpleasant symptoms of initial use, which typically include nausea and coughing. After an individual has smoked for some years, the avoidance of withdrawal symptoms and negative reinforcement become the key motivations to continue.

In a study done by Jennifer O' Loughlin and her colleagues, the first smoking experiences of seventh-grade students were studied.

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I am 47 almost 48, male with no history of depression (but it is in my family); and no familial history of heart disease as such (though my father...

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I am worried about my biker girlfriend she is 32 and has been smoking a pack of cigarettes a week and marijuana joints twice a week since age 16 ....

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As You told your girlfriend is chronic cigarette smoker and marihuana user and now she getting pregnancy related...

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I am 32 and my doctor was looking at an xray of mine and said oh thats interesting . should i be worried ? She told me that i had little white...

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In chest xray COPD has FOLLOWING FEATURES-1-HYPERINFLATED,2-DEPRESSED DOMES OF DIAPHRAGM,3-TUBULAR HEART ,4-INCREASED INTERCOSTAL...

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I am 47 almost 48, male with no history of depression (but it is in my family); and no familial history of heart disease as such (though my father...

doctor1 MD

hi i am 20 year old and a male, i was diagnosed with hpylori from a blood test and had all the symptoms about 3 weeks prior to getting results. i...

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Well I ve been to the emergency room twice and they ve found nothing. I m 27..female..I ve quit smoking 2 and a half weeks ago..I m overweight . I...

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My mum s ( 65yrs. stopped smoking 1 month ago.smoked little but all her adult life) chest Xray result said : ill defined density mid rigt lobe...

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