I like to look up and try to find the science behind things if I can so here is a more specific explanation:
*Pleural thickening was the most common finding on routine chest X-ray examinations and more than 90% of the cases were defined as a pulmonary apical cap with right lung predominance. Pleural thickening increased with age and was more frequent in males and smokers. We found that pleural thickening was associated with greater height and lower body weight and BMI. It may be that tall, thin body shapes exaggerate disproportionate perfusion, ventilation, or mechanical forces in the lungs, which may increase the risk of ischemia and/or a fibrotic response at the apex of the lung."
-https://respiratory-research.biomedcentral.com/articles/10.1186/s12931-019-1116-9