|Classification and external resources|
Nicotine poisoning describes the symptoms of the toxic effects of consuming nicotine, which can potentially be deadly, though serious or fatal overdoses are rare. Historically, most cases of nicotine poisoning have been the result of use of nicotine as an insecticide. More recent cases of poisoning typically appear to be in the form of Green Tobacco Sickness or due to accidental ingestion of tobacco or tobacco products or ingestion of nicotine containing plants.
The estimated lower limit of a lethal dose of nicotine has been reported as between 500 and 1000 mg. Children may become ill following ingestion of one cigarette; ingestion of more than this may cause a child to become severely ill. The nicotine in the e-liquid of an electronic cigarette can be hazardous to infants and children. In some cases children have become poisoned by topical medicinal creams which contain nicotine.
People who harvest or cultivate tobacco may experience Green Tobacco Sickness (GTS), a type of nicotine poisoning caused by dermal exposure to wet tobacco leaves. This occurs most commonly in young, inexperienced tobacco harvesters who do not consume tobacco.
The LD50 of nicotine is 50 mg/kg for rats and 3 mg/kg for mice. 0.5-1.0 mg/kg can be a lethal dosage for adult humans, and 0.1 mg/kg for children. However the widely used human LD50 estimate of 0.5–1.0 mg/kg was questioned in a 2013 review, in light of several documented cases of humans surviving much higher doses; the 2013 review suggests that the lower limit causing fatal outcomes is 500–1000 mg of ingested nicotine, corresponding to 6.5–13 mg/kg orally. An accidental ingestion of only 6 mg may be lethal to children.
It is unlikely that a person would overdose on nicotine through smoking alone. The US Food and Drug Administration (FDA) stated in 2013: "There are no significant safety concerns associated with using more than one OTC NRT at the same time, or using an OTC NRT at the same time as another nicotine-containing product—including a cigarette." Ingestion of nicotine pharmaceuticals, tobacco products, or nicotine containing plants may also lead to poisoning. Smoking excessive amounts of tobacco has also led to poisoning; a case was reported where two brothers smoked 17 and 18 pipes of tobacco in succession and were both fatally poisoned. Spilling an extremely high concentration of nicotine onto the skin can result in intoxication or even death since nicotine readily passes into the bloodstream following skin contact.
The recent rise in the use of electronic cigarettes, many forms of which are designed to be refilled with nicotine-containing "e-liquid" supplied in small plastic bottles, has renewed interest in nicotine overdoses, especially in the possibility of young children ingesting the liquids. A 2015 report on e-cigarettes by Public Health England noted an "unconfirmed newspaper report of a fatal poisoning of a two-year old child" and two published case reports of children of similar age who had recovered after ingesting e-liquid and vomiting. They also noted case reports of suicides by nicotine. Where adults drank liquid containing up to 1,500 mg of nicotine they recovered (helped by vomiting), but an ingestion apparently of about 10,000 mg was fatal, as was an injection. They commented that "Serious nicotine poisoning seems normally prevented by the fact that relatively low doses of nicotine cause nausea and vomiting, which stops users from further intake."
Signs and symptoms
Nicotine poisoning tends to produce symptoms that follow a biphasic pattern. The initial symptoms are mainly due to stimulatory effects and include nausea and vomiting, excessive salivation, abdominal pain, pallor, sweating, hypertension, tachycardia, ataxia, tremor, headache, dizziness, muscle fasciculations, and seizures. After the initial stimulatory phase, a later period of depressor effects can occur and may include symptoms of hypotension and bradycardia, central nervous system depression, coma, muscular weakness and/or paralysis, with difficulty breathing or respiratory failure.
The symptoms of nicotine poisoning are caused by excessive stimulation of nicotinic cholinergic neurons. Nicotine is an agonist at nicotinic acetylcholine receptor which are present in the central and autonomic nervous systems, and the neuromuscular junction. At low doses nicotine causes stimulatory effects on these receptors, however, higher doses or more sustained exposures can cause inhibitory effects leading to neuromuscular blockade.
It is sometimes reported that people poisoned by organophosphate insecticides experience the same symptoms as nicotine poisoning. Organophosphates inhibit an enzyme called acetylcholinesterase, causing a buildup of acetylcholine, excessive stimulation of all types of cholinergic neurons, and a wide range of symptoms. Nicotine is specific for nicotinic cholinergic receptors only and has some, but not all of the symptoms of organophosphate poisoning.
The initial treatment of nicotine poisoning may include the administration of activated charcoal to try to reduce gastrointestinal absorption. Treatment is mainly supportive and further care can include control of seizures with the administration of a benzodiazepine, intravenous fluids for hypotension, and administration of atropine for bradycardia. Respiratory failure may necessitate respiratory support with rapid sequence induction and mechanical ventilation. Hemodialysis, hemoperfusion or other extracorporeal techniques do not remove nicotine from the blood and are therefore not useful in enhancing elimination. Acidifying the urine could theoretically enhance nicotine excretion, although this is not recommended as it may cause complications of metabolic acidosis.
The prognosis is typically good when medical care is provided and patients adequately treated are unlikely to have any long-term sequelae. However, severely affected patients with prolonged seizures or respiratory failure may have ongoing impairments secondary to the hypoxia. It has been stated that if a patient survives nicotine poisoning during the first 4 hours, they usually recover completely.
- Lavoie FW, Harris TM (1991). "Fatal nicotine ingestion". The Journal of Emergency Medicine 9 (3): 133–6. doi:10.1016/0736-4679(91)90318-a. PMID 2050970.
- McNally WD (1920). "A report of five cases of poisoning by nicotine". Journal of Laboratory and Clinical Medicine 5: 213–217.
- McNally WD (1923). "A report of seven cases of nicotine poisoning". Journal of Laboratory and Clinical Medicine 8: 83–85.
- Schep LJ, Slaughter RJ, Beasley DM (September–October 2009). "Nicotinic plant poisoning". Clinical Toxicology (Philadelphia, Pa.) 47 (8): 771–81. doi:10.1080/15563650903252186. PMID 19778187.
- Smolinske SC, Spoerke DG, Spiller SK, Wruk KM, Kulig K, Rumack BH (January 1988). "Cigarette and nicotine chewing gum toxicity in children". Human Toxicology 7 (1): 27–31. doi:10.1177/096032718800700105. PMID 3346035.
- Furer V, Hersch M, Silvetzki N, Breuer GS, Zevin S (March 2011). "Nicotiana glauca (tree tobacco) intoxication--two cases in one family". Journal of Medical Toxicology 7 (1): 47–51. doi:10.1007/s13181-010-0102-x. PMID 20652661.
- Smolinske SC, Spiller SK, Spoerke DG, Wruk KM, Kulig K, Rumack BH (1985). "Paediatric nicotine overdose". Veterinary and Human Toxicology 28 (4): 308.
- Malizia E, Andreucci G, Alfani F, Smeriglio M, Nicholai P (April 1983). "Acute intoxication with nicotine alkaloids and cannabinoids in children from ingestion of cigarettes". Human Toxicology 2 (2): 315–6. doi:10.1177/096032718300200222. PMID 6862475.
- Brown, C. J.; Cheng, J. M. (2014). "Electronic cigarettes: product characterisation and design considerations". Tobacco Control 23 (Supplement 2): ii4–ii10. doi:10.1136/tobaccocontrol-2013-051476. ISSN 0964-4563. PMC 3995271. PMID 24732162.
- Davies P, Levy S, Pahari A, Martinez D (December 2001). "Acute nicotine poisoning associated with a traditional remedy for eczema". Archives of Disease in Childhood 85 (6): 500–2. doi:10.1136/adc.85.6.500. PMC 1718993. PMID 11719343.
- Gehlbach SH, Williams WA, Perry LD, Woodall JS (September 1974). "Green-tobacco sickness. An illness of tobacco harvesters". JAMA 229 (14): 1880–3. doi:10.1001/jama.1974.03230520022024. PMID 4479133.
- IPCS INCHEM
- Okamoto M, Kita T, Okuda H, Tanaka T, Nakashima T (Jul 1994). "Effects of aging on acute toxicity of nicotine in rats". Pharmacology & Toxicology 75 (1): 1–6. doi:10.1111/j.1600-0773.1994.tb00316.x. PMID 7971729.
- Mayer B (October 2013). "How much nicotine kills a human? Tracing back the generally accepted lethal dose to dubious self-experiments in the nineteenth century". Arch. Toxicol. 88 (1): 5–7. doi:10.1007/s00204-013-1127-0. PMC 3880486. PMID 24091634.
- Jimenez Ruiz, Carlos A.; Solano Reina, Segismundo; de Granda Orive, Jose Ignacio; Signes-Costa Minaya, Jaime; de Higes Martinez, Eva; Riesco Miranda, Juan Antonio; Altet Gómez, Neus; Lorza Blasco, Jose Javier; Barrueco Ferrero, Miguel; de Lucas Ramos, Pilar (2014). "El cigarrillo electrónico. Declaración oficial de la Sociedad Española de Neumología y Cirugía Torácica (SEPAR) sobre la eficacia, seguridad y regulación de los cigarrillos electrónicos". Archivos de Bronconeumología 50 (8): 362–367. doi:10.1016/j.arbres.2014.02.006. ISSN 0300-2896. PMID 24684764.
- "Consumer Updates: Nicotine Replacement Therapy Labels May Change". FDA. April 1, 2013.
- Woolf A, Burkhart K, Caraccio T, Litovitz T (1996). "Self-poisoning among adults using multiple transdermal nicotine patches". Journal of Toxicology. Clinical Toxicology 34 (6): 691–8. doi:10.3109/15563659609013830. PMID 8941198.
- Labelle A, Boulay LJ (March 1999). "An attempted suicide using transdermal nicotine patches". Canadian Journal of Psychiatry 44 (2): 190. PMID 10097845.
- Lockhart LP (1933). "Nicotine poisoning". British Medical Journal 1 (3762): 246–7. doi:10.1136/bmj.1.3762.246-c.
- Faulkner JM (1933). "Nicotine poisoning by absorption through the skin". JAMA 100 (21): 1664–1665. doi:10.1001/jama.1933.02740210012005.
- McNeill, A, SC (2015). "E - cigarettes: an evidence update A report commissioned by Public Health England" (PDF). www.gov.uk. UK: Public Health England. p. 63-64. Retrieved 20 August 2015.
- Oberst BB, McIntyre RA (April 1953). "Acute nicotine poisoning; case report". Pediatrics 11 (4): 338–40. PMID 13055344.
- Saxena K, Scheman A (December 1985). "Suicide plan by nicotine poisoning: a review of nicotine toxicity". Veterinary and Human Toxicology 27 (6): 495–7. PMID 4082460.
- Zevin S, Gourlay SG, Benowitz NL (1998). "Clinical pharmacology of nicotine". Clinics in Dermatology 16 (5): 557–64. doi:10.1016/s0738-081x(98)00038-8. PMID 9787965.
- Rosenberg J, Benowitz NL, Jacob P, Wilson KM (October 1980). "Disposition kinetics and effects of intravenous nicotine". Clinical Pharmacology and Therapeutics 28 (4): 517–22. doi:10.1038/clpt.1980.196. PMID 7408411.
- Rogers AJ, Denk LD, Wax PM (February 2004). "Catastrophic brain injury after nicotine insecticide ingestion". The Journal of Emergency Medicine 26 (2): 169–72. doi:10.1016/j.jemermed.2003.05.006. PMID 14980338.