Will giving up alcohol, smoking or losing weight help my AF?

In short, yes.

Excess alcohol consumption is clearly associated with AF, and AF ablation is likely to fail unless this is moderated. However, most people with AF can still be able to safely drink alcohol within healthy limits. 

Similarly, people who are obese are far more likely to have AF and losing weight really does help AF. In some people, this is enough to stop AF from being a problem for them, but in most it can improve the success of other treatments rather than being the most important thing.

Smoking is terrible for your health and you should stop it completely, whether or not it worsens your AF.