D. Deheinzelin, M. T. C. Lourenço, C. L. da Costa, and R. N. Younes, “ The level of nicotine dependence is an independent risk factor for cancer: a case control study ”, Clinics, vol. 60, no. 3, pp. 221–226, Jun. 2005, doi: 10.1590/S1807-59322005000300007.