This is an interesting study that discussed the association between incense smoke exposure lung function among adults in Saudi Arabia, here I offer some suggestions for consideration by the authors.
1. Some of the P-value in table 1 seems incorrect (for example, education level, current smoker, etc.), please recalculate these data.
2. Bakhour use at home should also be listed in table 1 if you discussed it in table 5.
3. What is the exposure level in occupational population as well as for those who use bakhour at home? What is the definition of bakhour use at home?
4. This study chooses occupational population as exposure group and university students as a control group. If the author would like to investigate the effect of incense smoke among the occupational population, then home exposure of bakhour should also be control in the model as a confounder.
5. ETS exposure should be defined at first use in the manuscript.
6. In the second line of the result section, BMI should also have an SI unit like age.