Nicotine and familial vulnerability to schizophrenia: a discordant twin study.
Lyons MJ, Bar JL, Kremen WS, Toomey R, Eisen SA, Goldberg J, Faraone SV, Tsuang M. Nicotine and familial vulnerability to schizophrenia: a discordant twin study. J Abnorm Psychol. 2002 Nov; 111(4):687-93.