Combination of smoking and heavy drinking ’speeds up cognitive decline’

The combination of smoking and heavy drinking speeds up cognitive decline, according to a new study by researchers in UCL Epidemiology & Public Health. The research, published in the British Journal of Psychiatry , found that smokers who drank alcohol heavily had a 36% faster cognitive decline compared to non-smoking moderate drinkers. Smoking and heavier alcohol consumption often co-occur, and their combined effect on cognition may be larger than the sum of their individual effects. The research team assessed 6,473 adults (4,635 men and 1,838 women) aged between 45 and 69 years old over a 10-year period. The adults were part of the Whitehall II cohort study of British civil servants. All the participants were asked about their cigarette and alcohol consumption, and their cognitive function (including verbal and mathematical reasoning, short-term verbal memory and verbal fluency) was then assessed three times over 10 years. The team found that in current smokers who were also heavy drinkers, cognitive decline was 36% faster than in non-smoking moderate drinkers.