“…Six out of 20 exposed workers were smokers, with a mean consumption o f eight (ran ge [3][4][5][6][7][8][9][10][11][12][13] cigarett es per day. Eleven out of 22 referents were smo kers, with a mean consumption of 12 (range [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] cigar ettes per da y. Of th e exposed subjects 13 had had radiographic examinations du ring the last year, and th ree regularly took drug s (theophyllin, terbutalin, pidolol , insulin).…”