Seems to be supported in many WWW pages.

@@ -16,0 +16,4 @@
+<sense>
+<pos>&n;</pos>
+<gloss>drug addiction</gloss>
+</sense>

the second sense I was thinking of was addiction, i.e. 依存
症. one of eij's glosses was "chemical addiction", and the 
wiki article does mention both. (nikk seems to only mention 
poisioning)

the usage here seems to refer to addiction rather than 
poisoning:

http://www.usamimi.info/~kintuba/zingi/zingidic-ha.html
ペイ中 　ヘロイン中毒者。ヘロインに限らず、麻薬中毒者や薬物中毒者全般を指して
使われることもある。

GG5, ルミナス, etc.

No need to go too far. I think the above puts the message across.

@@ -13,0 +13,2 @@
+<gloss>chemical poisoning</gloss>
+<gloss>drug poisoning</gloss>

wiki:
http://ja.wikipedia.org/wiki/薬物中�%
AF%92
(lists both 依存症 and 中毒 (as in poisoning))

eij lists:
chemical addiction
chemical poisoning
drug intoxication
drug overdose
drug poisoning
drug toxicity
medication intoxication
poisoning by drug
substance intoxication

nikk: 薬物による中毒。睡眠剤中毒などのように急性の副作用として現われるもの
と、モルヒネ製剤中毒などのように連用することによって現われる慢性のものとがある

2 senses? not sure which ones from eij to add.