I've personally never used them for urbex
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They only work if you have the correct 1 to filter what you want out of the air and that they fit correctly and are well maintained.
In industry you have a face fit to ensure the respirator / mask fits your face properly. If it doesn't you end up breathing in things thinking you are protected. Also with the likes of asbestos it will also be present on your clothes, bags, hair, shoes etc, if disturbed - so unless you also dispose of these you potentially will breath the fibres in after you have removed the mask as well as passing them onto your friends and family.
Does anyone have any tips or precautions, after care ideas or things they do to avoid the issue.
Go in drains
Found some in my last drain, insulation on some pipe work under an industrial site.
To be honest I smoke so asbestos is the least of my worries
Not a great combination though - "Researchers determined that smoking and asbestos exposure collectively can increase the risk of asbestos-related diseases up to 90 percent in some cases, while having little or no causal effect on other diseases."
This has come up a few times in safety briefings / courses in the last few years.