I will hope to research the relationship between anxiety level and smoking in our university
It depends on methods you are going to use. For survey you could use Generalised Anxiety Disorder Assessment (GAD-7), or more detailed Liebowitz social anxiety scale (LSAS), depending on your aims.
One single variable in line with a question of frequency could also give overview of the self-reported anxiety. For example: https://zenodo.org/records/8009806
Ekaterina Lyubenova Markova Thank you for your guidance. Following your feedback, I have conducted an internet search to study the two assessment methods. I decided that the GAD-7 scale appears to be the most suitable choice for my research.
I am glad to be of help. Good luck for your research. @Prabod Devinda