In the United States, “teenagers who reported that at least half of their friends were sexually active were 31 times likelier to get drunk, 5 1 / 2 times likelier to smoke and 22 1 / 2 times likelier to have tried marijuana, ” reports The New York Times.
كما ان احتمال التدخين هو اكبر بـ‍ ٥‏,٥ مرات عند الفريق الاول منه عند الفريق الثاني .‏