However, the long history of alcohol and other recreational drug use indicates that there are many people who choose to take the risks of alcohol and other recreational drug use.
https://store.samhsa.gov/sites/default/files/SAMHSA_Digital_Download/PEP21-03-10-006.pdf indicates that about 53% of college students drank alcohol in the past month. However, a parent is unlikely to know whether their student is in the group that does drink alcohol versus the group that does not. Parental advice not to drink alcohol is generally interpreted as parental disapproval (and hypocrisy if the parents themselves drink alcohol), so those students at residential colleges who do drink just avoid telling their parents.