As used in this chapter, "drug addict" means a person who shows signs of mental illness because of his or her use of drugs, hallucinogens, stimulants, or sedatives or who has an uncontrollable desire for their use or consumption. (Added 1967, No. 305 (Adj. Sess.), § 1, eff. Oct. 1, 1968; amended 1977, No. 208 (Adj. Sess.), § 4.)