55.有關物質使用疾患（substance use disorders）之敘述，下列何者最不適當？
A.使用迷幻劑（hallucinogens）會造成心理的的依賴
B.ketamine 是一種入門毒藥（gateway drug），意指慢慢上癮，逐漸引導習慣另一個成癮性更強的藥品
C.治療物質使用疾患（substance use disorders）的首要工作是處理戒斷症狀
D.大麻（marijuana）的戒斷症狀是焦慮、憂鬱、不安、失眠
答案:B
解析
Marijuana has been labeled as a “gateway drug,” meaning that it will lead to the use of “harder” drugs, such as cocaine or heroin. Marijuana is the most widely used illicit drug, but use of drugs such as alcohol and tobacco often predates marijuana use. No studies have conclusively demonstrated a causal link between marijuana use and subsequent other drug use.
參考資料APPLIED THERAPEUTICS The Clinical Use of Drugs ELEVENTH Edition p1889
補充:非法藥物使用者的合法入門藥（gateway drugs），在歐美國家是酒精、菸品；在台灣則是酒精、菸品與檳榔。
參考資料藥物食品安全週報20130315 (391期)
故本題最佳解答B