How does smoking affect asthma control in patients?

Smoking significantly worsens asthma control and leads to more frequent exacerbations. This is because the harmful substances in cigarette smoke can irritate the airways, causing inflammation and narrowing. In patients with asthma, this can lead to increased symptoms such as wheezing, coughing, and shortness of breath, making it more challenging to manage the condition effectively. Additionally, smoking can reduce the effectiveness of asthma medications, further contributing to poor asthma control.

When considering the other options, it's important to note that smoking does not improve lung function or respiratory health; rather, it harms the lungs and respiratory system overall. Moreover, smoking has a clear detrimental effect on asthma symptoms, contradicting the notion that it has no effect. Therefore, the assertion that smoking worsens asthma control and leads to more severe episodes is well established and supported by numerous studies and medical guidelines.