Smoking could be a factor for some women with acne; a study noted that those affected had whiteheads blackheads covering an area of their face and occasional pimples. Many of the women involved in the study were found to be smokers, with researchers noting a correlation, between the severity of acne and the number of cigarettes smoked. Some women experienced ice pick-type acne scars after their acne cleared. The study also observed that women who developed whiteheads alongside pimples were smokers.