A "severe pneumonia" could indeed result in permanent scarring in the lungs - and pleurisy can lead to permanent pleural scarring that could possibly prevent the affected lung from aerating (inflating) properly. Both of these could leave you more susceptible to pulmonary infections. Unfortunately, you have a variety of previous exposures that may negatively affect your condition as well. Many of the items you've listed can result in chronic lung diseases such as silicosis, asbestosis, occupational asthma, benign pneumoconiosis, etc. For example, exposure to asbestos can result in the chronic lung disease known as asbestosis - and it has a long latency period, that is - it may take 20 to 30 years after the exposure to develop symptoms. There is a rare and serious cancer - mesothelioma - almost exclusively linked to asbestos exposure. You need to be under the regular care of a pulmonologist (lung specialist) and I'd recommend you seek an appointment without delay...
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