habit – n. usual way of behaving : something that a person does often in a regular and repeated way : a strong need to use a drug, to smoke cigarettes, etc.

conduct – v. to plan and do (something, such as an activity)

tobacco – n. : a plant that produces leaves which are smoked in cigarettes, pipes, etc.

silver bullet – n. : something that very quickly and easily solves a serious problem

fashionable – adj. currently popular : dressing and acting in a way that is currently popular

appealing – adj. having qualities that people like : pleasing or attractive

epidemiology – n. medical : the study of how disease spreads and can be controlled

social circle – informal n. a group of close friends
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