Even small amounts of daily alcohol consumption significantly increase the risk of mouth cancer in India, according to a major new study published on December 23 in the open-access journal BMJ Global Health. Researchers found that consuming just 9 grams of alcohol a day — roughly one standard drink — was associated with a nearly 50% higher risk of cancer affecting the mouth’s inner lining.
The strongest association was seen with locally brewed alcoholic drinks, which are widely consumed in rural and tribal regions.
Mouth cancer remains a major killer
Mouth cancer is the second most commonly diagnosed cancer in India, causing an estimated 1.43 lakh new cases and nearly 80,000 deaths each year. Rates have steadily risen, particularly among men, reaching nearly 15 cases per 1 lakh population.
The most common form affects the buccal mucosa — the soft tissue lining the cheeks and lips. Survival remains poor, with only about 43% of patients living five years beyond diagnosis.
Alcohol and tobacco: a deadly combination
The study highlights the compounded danger of alcohol and chewing tobacco, both widely used in India. Researchers estimate that the interaction between the two may account for nearly 62% of all buccal mucosa cancer cases nationwide.
Compared to non-drinkers, people who consumed alcohol had a 68% higher cancer risk overall. The risk rose to 72% among those consuming internationally recognised drinks such as beer and spirits, and climbed sharply to 87% among consumers of locally brewed alcohol.
Even very low consumption levels were linked to increased risk. Drinking less than 2 grams of beer per day still showed an association with mouth cancer.
Why local alcohol poses greater risk
The researchers suggest that unregulated production may explain the higher danger from local brews. Such drinks can be contaminated with toxic substances like methanol and acetaldehyde, and in some cases may contain extremely high alcohol concentrations.
Alcohol is believed to increase cancer susceptibility by altering the fatty composition of the mouth’s lining, making it more permeable to carcinogens present in chewing tobacco.
Public health warning
Overall, the researchers estimate that nearly 11.5% of buccal mucosa cancer cases in India are directly linked to alcohol use alone, rising to about 14% in high-risk states such as Meghalaya, Assam and Madhya Pradesh.
The study concludes that there is no safe level of alcohol consumption when it comes to mouth cancer risk. Stronger public health measures to curb both alcohol and tobacco use, the authors say, could prevent a majority of these cancers in India.