Here are a few:
2005: pregnant women know smoking is harmful; many tried to give up; but "awareness and acceptance of specific risks were inadequate."
http://www.tandfonline.com/doi/abs/10.1080/09595239700186321
2005: "Knowledge and perceived risk of cardiovascular, pulmonary, and oral disease was high among current smokers; knowledge and perceived risk of reproductive-related problems, and cancers other than lung cancer was much lower. Smokers recognize that smoking may result in premature death, but are less likely to acknowledge that smoking could result in a disability significantly affecting their quality of life."
https://www.ncbi.nlm.nih.gov/pubmed/15850879
2015: "Only half of current smokers considered themselves at higher risk of lung cancer than the average-risk population, and less than 40% of individuals were aware that the risk of lung cancer never disappears after smoking cessation"
http://www.esmo.org/Conferences/Past-Conferences/ELCC-2015-L...