When one person (we'll call him the index case) quits smoking, his closest contacts, such as friends and family members, become 36% less likely to be smokers too. These folks then influence their social circles, and so forth, until people several degrees removed from the index case also become nonsmokers..........
Read more: http://www.time.com/time/health/article/0,8599,1808446,00.html#ixzz0p4zpbkkm
Read more: http://www.time.com/time/health/article/0,8599,1808446,00.html#ixzz0p4zpbkkm
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