A longitudinal analysis of US adolescents22 estimated that a 10% increase in the proportion of classmates who smoke will increase the likelihood of smoking by more than 3%, while an increase in smoking rates of 10% among an individual's close friends will increase the likelihood of smoking by 5%.
the timing of puberty and how fast or slow it progresses may be governed by different endocrine processes and may influence behavior in different ways. Hope I’ve helped ;)
