Fatal nicotine poisoning is extremely rare. Nicotine delivery via e-cigarettes poses little danger to adults. As with NRT, if people have more nicotine than they’re used to, they might feel a little nauseous or light-headed, both of which will pass quickly. If this happens, the person needs to reduce the level of nicotine in the e-liquid they’re buying, or use the e-cigarette less often.
In order to prevent accidental poisoning of children, e-cigarettes and e-liquid should be stored away safely, out of the reach of children, just as is the case with NRT products, household cleaning products and medicines.
 National Centre for Smoking Cessation and Training (NCSCT). Electronic cigarettes: a briefing for stop smoking services.(link is external) London: NCSCT; 2016.