The liver converts ethanol to acetaldehyde in an attempt to get the ethanol out of the bloodstream. Acetaldehyde is a know carcinogen but you need elevated quantities over a period of time to trigger tumors.
Acetaldehyde is also in tobacco smoke and in vaping. It is also naturally in some fruits, in fragrances, etc.
So if you have an occasional drink you are ok. It is the chronic exposure that is the problem.