How Long Does Nicotine Stay In Your System?

Nicotine remains in the bloodstream for about one to three days, though most of it is usually cleared within one day. However, cotinine (nicotine’s metabolite) can last in the body for several days.

How Long Nicotine Lasts In Your Body

Nicotine has a half-life of about two hours (meaning half of it is gone from your body about two hours after use). It can be detected in the blood for about one to three days, with most of it cleared from the bloodstream within one day.

However, nicotine’s byproducts can last longer. Cotinine, a substance formed by the breakdown of nicotine in the body, has a half-life of about 18 hours and typically stays in the blood for several days. Due to its longer detection window, it is often used to detect nicotine exposure.

Tests for the presence of nicotine can be performed on blood, urine, saliva, and hair, each with different detection time frames.

Individual nicotine metabolism rates also affect how long nicotine stays in the body. People who smoke tend to smoke more if they metabolize nicotine quickly, increasing the risk of smoking-related illnesses.

How Long Do Cravings and Withdrawal Last?

Nicotine is addictive, and cravings can start within a few hours of the last tobacco use. Cravings tend to keep occurring for days to weeks or longer after the body is no longer addicted to nicotine.

In addition to cravings, symptoms of nicotine withdrawal can begin within a few hours of last nicotine use. They typically last three to four weeks, with the strongest effects during the first week, particularly the first three days.

How Nicotine Affects the Body

Nicotine can reach the brain within 10 to 20 seconds after inhaling it and increases the levels of adrenaline and dopamine, which creates a pleasurable effect. Once that initial feeling fades, it can leave you feeling negative effects afterwards, prompting a desire to achieve that feeling again.

Over time, your body builds a tolerance to nicotine, meaning you need to consume more to get the same desired effects. This leads to a dependence or addiction:

• Physical dependence: When the body is used to a substance and can experience withdrawal symptoms if it is stopped
• Addiction: A mental or emotional dependence on a substance, causing a hard-to-resist urge to use it

Nicotine also:

• Increases blood pressure
• Increases respiration
• Increases heart rate
• Increases likelihood of having a heart attack
• Is particularly hazardous to the developing brains of children, adolescents, and young adults
• Can cause harm to a developing fetus

Can You Overdose on Nicotine?

It is possible to overdose on nicotine. This can happen more easily with e-cigarettes and vaping, which can contain high levels of nicotine. Many young people are unaware that these products contain nicotine, and can use enough to cause an overdose, sometimes called “nic-sick”.

Early symptoms (occurring within the first 15 minutes to an hour) of an overdose include:

• Nausea, vomiting, stomach ache, and/or loss of appetite
• Increased heart rate and blood pressure
• Headache
• Quick, heavy breathing
• Mouth watering
• Dizziness or tremors
• Confusion and anxiety

More symptoms may emerge anywhere from thirty minutes to four hours later. These include:

• Diarrhea
• Shallow breathing
• Extreme fatigue
• Slower heart rate and blood pressure
• Weakness, slow reflexes, or inability to control muscles
• Pale skin

Symptoms of Nicotine Withdrawal

Symptoms of nicotine withdrawal are typically strongest within the first days to weeks after stopping, and ease in severity and frequency over time.

Common nicotine withdrawal symptoms may include:

• Cravings for nicotine
• Irritability, frustration, or anger
• Restlessness
• Insomnia
• Difficulty concentrating
• Anxiety
• Hunger or increased appetite
• Depression
• Bad dreams or nightmares

Less common symptoms may include:

• Fatigue
• Headaches
• Dizziness
• Coughing
• Constipation
• Mouth ulcers

Ways to Quit Smoking

When quitting tobacco products, nicotine replacement therapy (NRT)—such as nicotine patches or nicotine gum—can help. These give a small, controlled amount of nicotine to help satisfy nicotine cravings and urges to smoke, without the other harmful chemicals in cigarettes.

NRT is more effective when combined with other strategies, such as:

• Avoiding craving triggers
• Substituting smoking with other activities, such as gum, exercise, or other enjoyable activities
• Engaging in meditation or relaxation techniques
• Getting smoking cessation counseling

Medications that do not contain nicotine, such as varenicline or bupropion, may also be an option. E-cigarettes are not recommended as smoking cessation aids.