Why cloth sofa will happen so smoked smell it? There are 3 possibilities. First, the problem of the plate, the second is sponge, the third is paint. Among the three, paint occupies the most potential. The content of formaldehyde contained in paint once exceeded not only seriously affect human health and irritating odor distribution. Serious can also cause atopic dermatitis, pigmentation, necrosis, high concentrations of formaldehyde can induce bronchial asthma and other symptoms.