Most lung cancer is caused by cigarettes. Many cancers have a "lifestyle" component. This does not mean that every single case of cancer is caused by something the person did. It does mean that we need to give people better information. Some lifestyle factors are much stronger than others. Smoking causes a lot of cancer. Alcohol causes less.

http://www.cancerresearchuk.org/about-cancer/lung-cancer/ris...

> Smoking tobacco is one of the biggest causes of lung cancer. More than 8 out of 10 lung cancers (80%) are caused by smoking .This includes breathing in other people’s cigarette smoke.

https://www.drinkaware.co.uk/alcohol-facts/health-effects-of...

> Over the long term, drinking alcohol increases your risk of serious illnesses, such as mouth, throat and breast cancer1. Of course, not everyone who drinks will get cancer. But scientists have found that some cancers are more common in people who drink alcohol than those who don’t.

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> One study has estimated that around 4% of all cancers are due to alcohol consumption