As per my understanding you are having asthma and is regularly using asthma drugs like inhaler etc, and wants to know whether it will cause lungs cancer. Several studies have shown that chronic inflammation in the lungs caused due to asthma may be a factor in causing lung cancer. That means when asthma, is combined with other causes, may increase the risk of lung cancer. Consult a pulmonologist, who on evaluating the patient will help you to identify the risk factor in your case. Hope our answer helps you.