what are health risk to seafarers regarding respiratory system.?

Answer 1

Seafarers who work on oil tankers tend to develop respiratory problems due to the high levels of noxious gases. Those who spend their days chipping paint and grinding on deck or in the engine room can develop respiratory problems if they do not use a proper dust mask.
On older ships a seafarer might be exposed to asbestos, which if not properly maintained can cause all sorts of respiratory problems.
But overall, worldwide, most seafarers face a greater danger from smoking than from respiratory problems inherent to their ships. If you smoke, you should quit as soon as possible.