Decarboxylation

Within the trichome’s resin dome,
A structured lattice finds its home—
THCA, with carboxyl bound,
(COOH) quietly compound.

Its carbon frame, a careful scheme,
A biosynthetic pathway’s dream—
From geranyl pyrophosphate start,
Enzymes assemble every part.

No psychoactive binding strong,
CB1 ignores it all along,
A molecule in waiting phase,
Inactive in its native haze.

Apply the heat—reaction starts,
A kinetic shift in molecular parts,
One group released as CO₂,
A simple loss—but meaning grew.

THCA \rightarrow THC + CO_2

Now THC, lipophilic, free,
Crosses membranes readily,
A partial agonist in play,
At CB1 it finds its way.

Neural signals subtly bend,
Synaptic patterns start to trend,
Dopamine pathways intertwine,
Temporal shifts in sense and time.

Two states defined by heat and form,
One stable, one transformed by warmth—
A lesson written, clear to see,
In organic chemistry.

If you want, I can go even deeper ( add reaction energetics,  receptor affinity, or  pharmacokinetics) or  simplify it slightly.