Smoking can lead to shoulder tendon ruptures. A 2015 study titled: Smoking Predisposes to Rotator Cuff Pathology and Shoulder Dysfunction: A Systematic Review, has confirmed it again.
Smoking promotes wear and tear of tendons, especially in the shoulder.
This phenomenon is caused by impaired collagen synthesis in smokers. As a result, smokers suffer shoulder tendon ruptures more frequently and at an earlier age than non-smokers. This is certainly not the only reason to consider quitting smoking.