Why is the Chai-Sutta (Tea-Cigarette) combination such a major success? What is the science behind it? IS it equally popular in countries apart from India?
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First of all the major reason is our habit & environment. Imagine you are a smoker and start your day. After getting ready what your mind tells you to do? Let's have a cigeratte. Now where will you head off to? I'm pretty sure that it will be a place where you'll find cigarettes. Possibly a Panwala guy and near to it a small stall of tea would be present(Like a blade & razor relationship). Hence, possibility of buying a tea is increased.
Second thing, most people don't smoke alone. Now these people have non-smoker friends and for sake of these nonsmoker's they will opt for place which sells tea and cigarettes nearby.
About its psychological effect. Tea contains caffeine and cigarettes contains nicotine. Hence, there will be double impact on brain which any smoker would like. A buzz which relieves you. A happy feeling. Also, most people smoke alone to get lost in thoughts.
These may be reason for chai-sutta be great combo! I'm not sure about other countries. But this is how this happens at India.