Not all of them - it just repels them some. And it doesn't work with just any cigarettes, they have to be the... the ones that are made for it.

[He runs a thumb idly back and forth over the wooden edge of the box, frowning in thought as he talks half to himself.] Suguro showed me how to make them, so I could stay longer and wouldn't be sick all the time, but... I don't know if I can get all that I need here.