Despite a growing health crisis that has killed more than 50 people, vaping has become an irresistible — and addictive — part of life for many college students. The University of Georgia banned tobacco use in 2014, and smoking cigarettes is widely frowned upon. But students with e-cigarettes dangling from their lips could be found across campus on a recent visit. They were vaping outside the student union and as they emerged from colonnaded buildings. They vaped while drinking in off-campus bars, the tiny diodes glowing white as they inhaled.