A group of scientists from China found in the genome of Europeans separate gene that prevent to give up the addiction. It was previously thought that nicotine dependence is only due to psychological factors and environmental factors.
Researchers from Zhejiang University (Hangzhou) tried to find the genes that define the degree of dependence on narcotic substances, including nicotine. It turned out that people with white skin color is quite common variation of the gene ANKK1 A1/A2 and A1/A1. This combination, experts say, creates additional difficulties in trying to give up cigarettes.
Note, nicotine dependence refers to the psychological category. Most people don't need nicotine substitutes to quit Smoking. To abandon cigarette is quite simple, sure doctors just need to want it for real.