Updated on 2 September 2013
The team studied the genetic profile of intestinal bacteria found in faecal samples provided by 20 volunteers over nine weeks. The participants comprised five non-smokers, five smokers and 10 people, who had quit smoking one week after the study began.
Not much of a difference was noticed in the bacterial biodiversity among the persistent smokers and non-smokers. However, for those who had just given up smoking, there was a clear shift towards more Proteobacteria and Bacteroidetes, the study pointed out.
The team noticed that over the study period, the people who had quit smoking also gained an average of 2.2 kilos, even though they insisted that their eating and drinking habits were unchanged.