Definition of elucidating
Several twin studies have led to estimates of 46-84% heritability for smoking.
The rest passes into the bloodstream, reaching the brain in about 10 seconds and dispersing throughout the body in about 20 seconds.
Depending on the circumstances and the amount consumed, nicotine can act as either a stimulant or tranquilizer.
Carbon monoxide limits the amount of oxygen that the red blood cells can convey throughout your body.
Also, it may damage the inner walls of the arteries, which allows fat to build up in them.
It is thought that some genetic variations affect the speed of nicotine metabolism in the body and the activity level of nicotinic receptors in the brain.
Epinephrine causes several physiological changes—it temporarily narrows the arteries, raises the blood pressure, raises the levels of fat in the blood, and increases the heart rate and flow of blood from the heart.
The initial "kick" results in part from the drug's stimulation of the adrenal glands and resulting release of epinephrine into the blood.It isn't known how much nicotine may be consumed before the body becomes addicted.However, once smoking becomes a habit, the smoker faces a lifetime of health risks associated with one of the strongest addictions known to man.Smoke from a cigarette, pipe, or cigar is made up of many additional toxic chemicals, including tar and carbon monoxide.Tar is a sticky substance that forms into deposits in the lungs, causing lung cancer and respiratory distress.Although specific genes have not yet been identified as of 2003, researchers think that genetic factors contribute substantially to developing a smoking habit.