These guys have laid down the gospel, so there's not much more I can add. But, in typical fashion, I gotta interject something.
First: I'm not a college student. Not anymore. Did my time back in the mid/late nineties. I'm probably a borderline "old fart" to you at 38, but I can promise you one thing. Life is not going to become less stressful. Don't fool yourself like that. Looking back over my life, those were some great years, and I wasted my health with nicotine. I wouldn't change a thing, but I assure you my life is more stressful now, mainly because of the number of people that are dependent on me for various things. Wife, kids, aging parents, coworkers, contractors, etc, etc.
So, my point is basically that now is the best time for quitting. Right now.
Reach out if you need anything. We're here to help.