Do I need a Nexus 5?

The better question is: Do I need a smartphone?

I'm a college student, and I currently have a brick-phone. I see many people (and all users on this site) talking greatly about them, but what benefits, if any, do they offer?

My main concern is that I will become addicted to a smartphone, in this case, a Nexus 5 if I get one. Every student I see in school is always using one -- sometimes just swiping between screens, customizing their home screen, or just turning it on every few minutes to check if they have a new notification, even when I'm having breakfast or lunch with them. I do not want that to be me.

So, what do you guys think? Should I get one? Your opinions are greatly appreciated!