|Smoking is addiction ie. even if someone wants to quit, they cannot because cigarettes contain nicotine which actually alters the level of neurotransmitters in brain and changes the mood of a person. it produces pleasure, reduces anxiety stress etc. Smokers enjoy the nicotine rush and become dependent on smoking. The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information. The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.