I loved you much;
It's not enough
You love blow
And I love puff

from Amy Winehouse – Back to Black Lyrics on Rap Genius

Meaning

They really love each other, but love wasn’t enough to overcome the fundamental differences between them. They each come from very different scenes: he’s a cocaine user (blow) and she smokes weed/pot/marijuana (puff), illustrating the prominent role that drugs play in Amy’s life and relationships.

A cocaine user, being energetic and neurotic, is probably terrible company for a sedate and lethargic pothead (marijuana user) that just wants to “chill”.

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