Tobacco smoke contains the psychoactive alkaloids nicotine and harmane, which combined give rise to addictive stimulant and euphoriant properties. The effect of nicotine in first time or irregular users is an increase in alertness and memory, and mild euphoria. Nicotine also disturbs metabolism and suppresses appetite. This is because nicotine, like many stimulants, temporarily increases blood sugar levels.
Medical research has determined that tobacco smoking causes lung cancer, emphysema, and cardiovascular disease among other health problems. The World Health Organization reported that tobacco smoking killed 100 million people worldwide in the 20th century and warned that it could kill one billion people around the world in the 21st century.
by Efrat
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