Only smiling at others works well in small town settings with few people, as larger cities have too many people where most don't make eye contact. Smiling has a double positive effect, as it relaxes the smiler both from walking and from smiling at others, in a way that encourages people in small friendly towns.

1. Feedback smile project 125 april 2011Behaviour Design

2. Only in certain settings does it workCity and sunglasses don’t work:Too many people, People don’t look at other peopleFew people works bestSmall town culture is more friendly , encourage eachother when running

3. It is like double effectWhen you walk and smile to people , you relax by walking and you relax by smiling to people