If it is your cat, cleaning out the box more often can help. Also, you can put some menthol or other cream under your nose to distract you.
It would seem that you just do. Some people can't stand the smell of other things.
No, the smell of cat litter cannot cause a miscarriage.
It could be a comfort zone for the cat, or the cat is sick. Has it been acting sick?
It can, if you have a strong sense of smell.
it could be that your cat is sick or unhappy
Take him/her to the vets AS SOON AS YOU CAN!
You can put cat litter in the litter box and allow your cat(s) and/or kitten(s) to use the litter box as their own personal toilet. Just don't forget to change the litter frequently or it will start to smell!
It is not suggested that you do. I don't even think it burns.
They wont care but you should still keep an eye out and observe!
They do stink (if you don't clean them). Especially covered litter boxes tend to stink less as the odor gets trapped inside. There are also self cleaning litter boxes, they tend to stink less as they automatically clean the litter after 20 seconds. The details of the litter boxes and a guide on how to maintain them are here: catlitterboxguide.com/3-best-litter-boxes-for-your-cat/
Cat is a feline specie which is very clean by nature and can get sick if exposed to unhygienic condition. Therefore their sperm does not smell bad.
it would get you very sick; so i say yes
They may be untrained or sick, take them to the vet