Consequences of damaged, broken, or missing dryer vent:

– Fire hazard, because of the Lint produced by drying clothes.
– Moisture trapped in a Dryer area which in turn leads to Mold growth and health issues.
– Gas dryers produce Carbon Monoxide which if leaks from a broken or missing vent, is a Safety hazard.

A recommendation would be monitoring your dryer vent regularly and make sure there is enough space for dryer vent.