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Ammonia, for instance, is often added to reduce harshness and enhance nicotine absorption: "Cigarette companies control the impact and delivery of nicotine in many ways, including designing filters and selecting cigarette paper to maximise the ingestion of nicotine, adding ammonia to make the cigarette taste less harsh, and controlling the physical and chemical make-up of the tobacco blend." In Bahrain and the wider WHO Eastern Mediterranean Region, cigarettes tend to have higher yields of nicotine, tar, and carbon monoxide compared to those sold in Europe or the Americas

The repository also contained information about patient lifestyles, including smoking and drinking habits, and a DNA sample from each patient allowing the team to investigate whether patient lifestyle and genetic factors could affect the failure rate of composite fillings

For all the imperfections of the data, there is every reason to believe that Italian female smoking did increase in those decades

Further, this could also explain the significant interaction between anxiety and smoking on the relationship with breastfeeding duration