George Burns drank alcohol and smoked and lived to be over 100 years of age
So, with this counter example, I have proved that we are all equally likely to die of cancer, regardless of whether we drink or smoke
That is the logic being used - but we know that drinking alcohol and smoking definitely make cancer a lot more likely:
https://www.cancer.org/cancer/cancer-causes/diet-physical-activity/alcohol-use-and-cancer.html
https://www.cdc.gov/cancer/lung/basic_info/risk_factors.htm
Also found this on cancer and artificial sweeteners:
Just keep in mind, the first few years of alcohol feel great - the first few months of cocaine feel great - the first few weeks of meth feel great…