The reasons for smoking addiction are as follows: 1, biological factors: that is, the role of nicotine, which is characterized by first excitement and then inhibition, tobacco combustion can produce carbon monoxide, so that the brain is inhibited, resulting in reduced work efficiency or memory, when the use of nicotine can stimulate the brain, strengthen the recovery of memory, long-term use can produce nicotine addiction; 2, psychological factors: that is, psychological dependence, that smoking can relieve the various pressures of society; 3, social factors: smoking is a social means, smokers hope to integrate into society through smoking.