People who stop drinking alcohol lower their colorectal and breast cancer risk

• Accumulating evidence shows that people who cut out alcohol can reduce their risk of developing some forms of cancer.
• Decreasing alcohol intake decreases the production of acetaldehyde in the body, which in turn, reduces the risk of certain cancers.
• Researchers and experts agree that continuing abstaining from alcohol is the only way to see long-term, positive health effects. (for more Can drinking less alcohol reduce your risk of cancer? (medicalnewstoday.com)

Also see 

• For Your Health, No Amount of Alcohol Is Safe
• Drinking just ONE glass of wine or pint of beer each night 'may raise your cancer risk by 5%' as scientists warn the safest amount of alcohol is NONE
• Alcohol consumption and liver, pancreatic, head and neck cancers in Australia: 2017