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(BTS') core functions are:
The relief of sickness of people with respiratory and associated disorders by the promotion of the highest standards of clinical care and the undertaking of research into the causes, prevention and treatment of respiratory and associated disorders, and disseminating the results of such research.
The preservation and protection of public health by the provision of information in matters concerning respiratory and associated disorders and how they might be prevented. - BTS website
The British Thoracic Society publishes journals and guidelines, promotes research, and organises training events, conferences and so on to do with lung diseases including asthma, pneumothorax, tuberculosis, and lung cancer.