Can an app change human behavior? This behavioral economics professor is banking on it

Whether personal or professional, change is hard. And the cumulative data is not on our side. 
Take something obviously detrimental, like smoking. A mere 4% to 7% of people successfully quit without the aid of medication or outside help. Even experiencing a traumatic event — like the death of a loved one or being diagnosed with cancer — only leads to a 20% success rate. 
Not to be a killjoy, but as the Washington Post found, roughly 25% of New Year resolutions fall apart wi