Cannabis & Alcohol — The Unpredictable Combination

When combined, they alter each other's effects: alcohol increases THC blood plasma levels by +30–50% (Lukas & Orozco 2001).

TL;DR: Alcohol → vasodilation → faster THC absorption, higher levels. Consequences: more intense and frequent 'whiteouts' (paleness, sweating, collapse), greater cognitive impairment. Accident risk is additive (Ramaekers 2011).

What Happens Pharmacologically

Alcohol dilates peripheral blood vessels → cannabinoids reach higher plasma levels more quickly.

Both depress the cerebellum (balance) — effects multiply rather than just add up.

Cannabinoids suppress the gag reflex — posing an aspiration risk during acute alcohol poisoning.

The 'Whitey' Phenomenon

Alcohol + high THC dose: sudden paleness, sweating, nausea, rapid heart rate, anxiety, collapse.

Usually harmless, lasting 15–60 min. Management: lie down, elevate legs, drink water, black pepper (beta-caryophyllene).

FAQ

Is driving under the influence illegal?

Doubly critical. 0.5 ‰ BAC + 1.5 µg/L THC = severe penalties.

Rules for combining them?

Halve the alcohol, reduce the THC dose, and avoid intense inhalation.