Really carcinogenic on its own. The IARC evaluated areca nut without tobacco and still placed it in Group 1, carcinogenic to humans, on the strength of evidence linking it to cancers of the mouth, pharynx and oesophagus. Adding tobacco to the quid raises the risk further, and slaked lime in the quid adds its own irritation, but removing them does not make the nut safe. Arecoline itself is separately flagged as possibly carcinogenic.

Areca contains no caffeine at all. The effect comes from arecoline and related alkaloids, which stimulate muscarinic receptors. That produces the classic picture of heavy salivation, a warm flush, sweating, a faster heartbeat and mild euphoria within a few minutes. The same receptor activity can tighten the airways, which is why areca chewing is associated with poorer asthma control.

It usually starts with a burning sensation when eating spicy food, a blotchy or blanched look to the inside of the cheeks, and dulled taste. Over time the cheek and palate tissue stiffens into palpable bands, the mouth opens less and less, and swallowing gets harder. It is a recognised precancerous condition, it does not resolve by itself, and the risk of it turning malignant is why it needs specialist follow-up.

Not legitimately. The FDA treats areca nut as an unsafe food additive because of its alkaloid content, and in 2025 it issued an import alert allowing detention of foods, dietary supplements and bulk ingredients containing areca nut, along with tableware made from the palm leaves. Products still turn up in specialist shops and imported snack mixes labelled as supari or mouth freshener, so read ingredient lists on imported paan masala.