Read a report of nicotine toxicity being linked to seizures, can it be linked to epilepsy or only one seizure?

Epilepsy is a disorder all on it’s own, and is unlikely to be caused by tobacco use. If you have epilepsy and use tobacco, you are more likely to have a seizure than if you don’t use tobacco. If you don’t have epilepsy and use enough tobacco, that could potentially cause a seizure as well, although you would probably have a lot of vomiting and diarrhea before you got to that point.

If an unusually large amount of nicotine were ingested, secondary to abuse or accident, a seizure would be the least of the outcomes, as nicotine is indeed a poison. However, standard smoking would not be sufficient to cause epilepsy, and cessation of smoking would not result in withdrawal seizures.