According to the US Fire Administration:
This is true for both residential and commercial dryer vents.
When you have a functional dryer vent, it can lead to significantly lower power bills. A clean vent won’t clog up, which will lessen the running time on your dryer. Lint buildup can sometimes make a dryer emit burning odors that smell awful. These smells can hang onto your clothing. Many odors can easily get trapped within dust particles; however, a cleaning job easily mitigates this issue. It’s recommended to clean your dryer vent annually!