addiction

disposition

bent, inclination, proclivity, set, tendency, tenor, turn

bag, convention, form, mode, style

usage, use

deportment, manners, mores

drill, groove, jog trot, regime (also régime), regimen, rote, routine, rut

affectation, airs, pose

attribute, characteristic, mark, trait

eccentricity, kink, oddity, peculiarity, quirk, singularity, tic