One strength for research into resistance of social influence is the practical applications and evidence to support this. Teen Fresh Start USA is a program to help pregnant adolescents resist peer pressure to smoke, this is done by adding social support in the form of a mentor. After 8 weeks it was shown that teenagers who had buddies were significantly less likely to smoke than a control group who didn't. This supports the concept for social support increasing the ability to resist conformity. Furthermore in one variation of milgrams study, obedience rates to shock to the full 450V dropped from 65% - 10% when an 2 undercover confederate joined the participant and disobeyed the experimenters orders. This is a strength because it shows that social support is important in bringing about independent behaviour and reducing social influence.In 1967 Holland repeated milgrams experiment and measured weather the participants were further towards external or internal on the locus of control continuum. It was found that 37% of internals and 23% of externals did not shock to the full 450V, suggesting that resistance to social influence is at least somewhat influenced by locus of control.