“…5,6 Although natural antibodies against environmental carcinogens have been described in references 7-11, the biological consequences of such antibodies have only recently been investigated. 12,13 Hapten-specific antibodies against biologically active low molecular weight compounds have been widely applied as therapeutic agents to reverse their pharmacological effects, [14][15][16][17][18][19][20][21][22] but their use as immunoprophylactic agents has only recently gained some interest. 12,[23][24][25][26][27][28][29] Several candidate vaccines against nicotine and cotinine, its major metabolite, have been developed and are in clinical trials.…”