An "inebriate" person is anyone over the age of eighteen
years who is incapable or unfit to properly conduct himself or
herself, or his or her affairs, or is dangerous to himself or
herself or others, by reason of periodical, frequent or constant
drunkenness, induced either by the use of alcoholic or other
liquors, or of opium, morphine, or other narcotic or intoxicating
or stupefying substance.