WordNet sense 1 (brought about or set up or accepted; especially long established):

constituted, established

WordNet sense 2 (commonly used or practiced; usual):

accustomed, customary, wonted

WordNet sense 3 (occurring or encountered or experienced or observed frequently or in accordance with regular practice or procedure):

usual

WordNet sense 4 (having a habit of long standing):

confirmed, inveterate

WordNet sense 5 (compulsively or physiologically dependent on something habit-forming):

addicted