“Hey, man, can I have a smoke?”Startled from his private thoughts, Tobias Elder tried to keep walking past the man who asked him for a cigarette. The man looked like he could be a gang member, Elder says, and Elder was not in the mood to barter over cigarettes, so he tossed him the whole pack and tried to move on.To his surprise, the man followed him and looped an arm across his shoulders, asking what was wrong. When ...