Slugs are, for the most part, harmless to humans. I'm frankly not sure what the second half of your question is supposed to mean. About the only way a slug could hurt you is if you ate it; and it would likely be parasites in the slug, rather than the slug itself, that caused the problem.
No
Yes, diatomaceous earth can effectively kill slugs by dehydrating them when they come into contact with it.
Salt will kill slugs because the slugs body is covered in mucus and the salt will dry up the mucus and in a matter of time the slug will die.
kill them
plants are not slugs
Outside of an explosive like a firework, nothing 'blows' slugs up. However, salt does damage and often kill slugs.
Iodized salt.
Open the taps.
Hire Davis
salt will kill slugs but leaves a nasty mess to clear up
Yes, but not with salt. Salt can kill the plant.
Yes, slug pellets kill slugs even though there are two more humane methods. Slugs cannot crawl over, and will retreat from, garden plots surrounded by fine sharp gravel or a ring of sand. Slugs will not cross over the line made by adhesive copper tape stuck around the pot or tub holder in a band.