Because today's traditional-aged student often worked while in high school, there is no reason to discontinue working while in college. As well, there are many students who work up to full-time jobs and may only attend classes part-time. In the end, working a job can provide spending money, assist with covering tuition charges, reduce reliance on loans, and provide students a balanced schedule to assist with time management.
While work-study jobs are available only to students awarded work-study as part of their aid package, there are many jobs available on- and off-campus for students seeking employment.
Resources here can assist you in finding a job to assist you in meeting costs while in college.