Nicotine in cigarettes is what makes them so addictive. Nicotine is a stimulant that releases beta-endorphins, the natural chemical in our brains that makes us feel good. Smokers will reach for a cigarette when they are stressed as it will make them feel calm, in control but alert at the same time. It is easy to get used to this feeling and need it more and more but as the body can't store nicotine, more cigarettes are needed to keep producing the same effect.
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Cigarettes are addicting because one main ingredient is called nicotine. Nicotine somehow travels through the blood stream and directly to the brain when inhaled. Because nicotine gets sent directly to the brain, it causes your brain to demand more of it, and there's the classic story of why cigarettes are so addicting.
every human has nicotine in their body, and when a person starts smoking their body tends to be used to with a high dosage of nicotine and once the body is already used to a high dose of this chemical it would be very hard for the body not to have it in a lower or lesser dose, that's why cigarettes are addictive, it is because you're body is already dependent on receiving a high dose of nicotine. . .
additional: it's not nicotine that kills you when you smoke, it's tar which is also a chemical present in cigarettes, they are the ones that builds up in your lungs and clogs the cavities in your lungs, that's why smokers have a hard time in breathing.