I didn’t find anything with a similar name to ashtray among Miguel Pinero’s poems. Here is a list of all his poems, take a look.
Cocaine Nose - Acid Face
Black Woman With The Blond Wig On
Seekin' The Cause
Visitin' A Friend At The Cold Shop
Spring Garden - Philadelphia
The Book of Genesis According to St. Miguelito
Kill, Kill, Kill
La Bodega Sold Dreams
On The Lock-In
On The Day They Birthed My Mother...
New York City Hard Time Blues
Running Scared
This Is Not The Place Where I Was Born
Jitterbug Jesus
You said there should be my ashtray became a cemetary in "The Ashtray" The phrase "for all my dead thoughts" means that the ashtray is the cemetery where memories are buried. It seems to come not from a poem but from one of his movie lines.