It is this substance in the brain that is liable for bad habits. Breakthrough after years of research

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Our ability to let go of old habits and adapt to a abrupt change in circumstances is influenced by a neurotransmitter called acetylcholine, according to a survey published in the diary Nature Communications. The substance is secreted in the brain under the influence of disappointment at the deficiency of reward and gives a signal to abandon old routines in favour of new, more effective strategies.