In asthma:
(i) Respiratory surface is decreased.
(ii) Cigarette smoking is one of its causes. It can occur due to air pollution, dust allergies etc.
(iii) The symptoms of asthma begin with the inflammation of bronchi and bronchioles.
(iv) Alveolar walls are damaged in asthma
(v) Asthma results in difficulty in breathing, causing wheezing. Hence, only one statement is wrong. So, the correct answer is 'The only cause of it, is cigarette smoking'.