/ə'dɪkʃn; ə`dɪkʃən/
n [U, C] ~ (to sth) condition of taking drugs, etc habitually and being unable to stop doing so without suffering adverse effects 瘾; 沉溺
*heroin addiction 海洛因毒瘾
* overcome one's addiction to alcohol 克制酒瘾.

n [U and C]
the need to take a harmful drug regularly, without being able to stop
drug/heroin/alcohol etc addiction
addiction to
　addiction to alcohol
a strong desire to do or have something regularly