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Given a lantern (originally made for kerosene) however, I’m looking for the fuel which is the safest for indoor use.

I’ve already tried different kinds, and found three of them that burn just as nicely: kerosene, diesel and sunflower oil, which means, all of these seem to produce nearly the same light, the same heat, and none of them becomes smoky on a medium flame.

The only differences I experience:

Kerosene stinks quiet badly, and costs 5-6 times as much as the other two.
Diesel stinks just a little bit and is pretty cheap.
Sunflower oil doesn’t stink at all and is the cheapest.
So from my experiences, I’d go with sunflower oil.

But the most important question is, based on which I will decide: Which one produces the least poisoning stuff when burnt? So what might be in the air I can’t see and should be afraid of.

(once again: The lantern is always set to a flame that doesn’t produce any visible smoke at all.)