Squamous Cell Lung Carcinoma – It is the second most prevalent type of lung cancer after lung adenocarcinoma and it originates in the bronchi. Its tumor cells are characterized by a squamous appearance, similar to the one observed in epidermal cells. Squamous-cell carcinoma of the lung is strongly associated with tobacco smoking, more than any other form of NSCLC.
Source: https://en.m.wikipedia.org/wiki/Squamous-cell_carcinoma_of_the_lung