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Nicotine is poisonous and, though uncommon, overdose is possible.
An overdose occurs when the person uses too much of a drug and has a toxic reaction that results in serious, harmful symptoms or death.
Secondhand smoke exposure can also lead to lung cancer and heart disease.
It can cause health problems in both adults and children, such as coughing, phlegm, reduced lung function, pneumonia, and bronchitis.
Current FDA-approved NRT products include chewing gum, transdermal patch, nasal sprays, inhalers, and lozenges.
NRTs deliver a controlled dose of nicotine to relieve withdrawal symptoms while the person tries to quit.
Chewed tobacco products include chewing tobacco, snuff, dip, and snus; snuff can also be sniffed.
The nicotine in any tobacco product readily absorbs into the blood when a person uses it.
They target nicotine receptors in the brain, easing withdrawal symptoms and blocking the effects of nicotine if people start smoking again.
But researchers actually know little about the health risks of using these devices.
Read more about e-cigarettes in our Pregnant women who smoke cigarettes run an increased risk of miscarriage, stillborn or premature infants, or infants with low birth weight.
Anyone concerned that a child or adult might be experiencing a nicotine overdose should seek immediate medical help.
This publication is available for your use and may be reproduced in its entirety without permission from the NIDA. For help from the National Cancer Institute: 1-877-44U-QUIT (1-877-448-7848) The National Cancer Institute's trained counselors are available to provide information and help with quitting in English or Spanish, Monday through Friday, a.m.
Although nicotine is addictive, most of the severe health effects of tobacco use comes from other chemicals.