The severity of lung nodules caused by smoking depends on the nature of the nodules. If the nodules are benign, they are generally not serious and regular checkups are sufficient, while if they are malignant, they are more serious and require active treatment. Long-term smoking is harmful to health and can lead to the formation of nodules in the lungs. Generally speaking, most lung nodules are benign, but patients with a history of long-term smoking need to be more vigilant, as smoking can greatly increase the incidence of lung cancer. After checking the lung nodules, you can judge the benign or malignant nature of the nodules according to the size, density, morphology and growth rate of the nodules under the guidance of your doctor. If the nodules are small, slow-growing or non-progressing, and benign with a regular morphology, they are generally not serious and can be reviewed regularly; if the nodules are large, with lobular or burr signs, and rapidly increasing, you need to consider the malignant nodules, which are more serious and need to be treated aggressively. The severity of lung nodules should be analyzed according to the specific situation, and it is recommended to go to the hospital and cooperate with professional doctors to diagnose. It is recommended to quit smoking in time, and actively consult the doctor to avoid the delay of the disease.