B:	because it usually requires more and more of that substance that you're misusing to get the same effect.
b iː WORD_BOUNDARY b ɪ k ʌ z WORD_BOUNDARY ɪ t WORD_BOUNDARY j uː ʒ uː ə l i WORD_BOUNDARY ɹ ɪ k w aɪ ə ɹ z WORD_BOUNDARY m ɔ ɹ WORD_BOUNDARY æ n d WORD_BOUNDARY m ɔ ɹ WORD_BOUNDARY ʌ v WORD_BOUNDARY ð æ t WORD_BOUNDARY s ʌ b s t ə n s WORD_BOUNDARY ð æ t WORD_BOUNDARY j ʊ ɹ WORD_BOUNDARY m ɪ s j uː z ɪ ŋ WORD_BOUNDARY t ə WORD_BOUNDARY ɡ ɛ t WORD_BOUNDARY ð ə WORD_BOUNDARY s eɪ m WORD_BOUNDARY ɪ f ɛ k t WORD_BOUNDARY