Any exposure to asbestos can be dangerous if the asbestos comes apart and goes through the air and gets breathed in.
Asbestos is usually not dangerous to your health when it's not disturbed or flying through the air.
When asbestos gets disturbed or comes apart and particles of the asbestos flies through the air and you breathe the asbestos particles in then it becomes dangerous to your health.
That's why when you need asbestos removed from a house or building you need qualified people who have the proper equipment and gloves, breathing devices etc to keep them safe from the asbestos exposure.
If you continue to breathe in a lot of asbestos then it could cause lung cancer to develop but it usually takes years after being exposed to the asbestos to get the lung cancer or mesothelioma.
People who have developed the condition mesothelioma cancer have been working in factories or around asbestos for 20 or more years before they developed the mesothelioma.
If you've developed mesothelioma as a result of working around or near it then you can usually sue and get compensation for the mesothelioma.
Although mesothelioma is not something you want to get because it's a bad way to die.