You probably have read from EU level nicotine is toxic and the current LD50 has been about 30-60mg for over 150 years. Recently the limit has been redefine to be around 0,5-1g (1000mg). But is is lethal?
A 36 years old woman tried to commit suicide by ingesting 50ml of 30mg/ml nicotine liquid and result? After two hours ingestion the symptoms present were abdominal pain, nausea, and voluminous vomiting. Treatment was activated charcoal and observation for 6 hours.
So the EU's plan to restrict nicotine sales only to 10ml bottles cannot be justified with toxic content.
Source
(I would have posted this post somewhere else in 1st place but I am still under 10 post limit)