Gateway Drugs: What They Are and How They Lead to Addiction

What Is a Gateway Drug?

A gateway drug is a substance whose usage has been linked to an increase in the likelihood of trying other drugs later in life.[1] This term does not imply that using one drug will automatically mean that someone will use others or develop an addiction.

It instead describes a pattern that researchers have observed about how people who use certain substances, typically at a younger age, are statistically more likely to move on to other illicit substances later in life.[2]

The National Institute on Drug Abuse (NIDA), a federal research agency, has conducted extensive research concerning these patterns over the past several decades, with findings indicating that the substances most often referenced as “gateway” drugs are those that are most widely available and socially accepted.[3] This social acceptance contributes to them becoming a person’s first experience with a substance.

It’s worth noting that attempting a gateway drug does not necessarily lead to someone developing a substance use disorder. Many people experiment with substances, specifically alcohol or tobacco, and do not try anything else. But at a population level, the pattern is consistent enough that public health researchers continue to study it closely.

The Gateway Hypothesis: How Substance Use Progresses

The concept of the “gateway hypothesis,” originally developed by Denise Kandel, hypothesizes that substance use often follows a sequence, beginning with common legal substances like alcohol or tobacco, followed by cannabis, and ultimately progressing to illicit substances like cocaine or heroin.[4]

There are a number of possible explanations for this progression:

• Changes in brain chemistry. Early substance use during adolescence has been associated with differences in brain development and an increased risk of developing substance use disorders later in life.[5] These changes alone can make further experimentation feel more rewarding.
• Exposure to environments and social situations: Using one substance often means spending time in situations or with people where other substances are also present.
• Lowered perceptions of risk: Once a substance is used without any serious consequences, a person may perceive less risk in using it again.

Some researchers refer to this pattern as the gateway theory rather than a strict hypothesis, since it describes a correlation rather than a guaranteed cause-and-effect relationship. Not everyone agrees on how strong the connection is, and other factors, including genetics, family environment, and mental health, also play a significant role in whether someone’s drug use progresses.[6]

Common Gateway Drugs

The substances most often identified by researchers and public health professionals as gateway drugs include:

Alcohol

Because of how normalized and easily available it is, alcohol is typically the first substance that young people try. Regular alcohol use during adolescence has been associated with a higher likelihood of later illicit drug use, and adolescent alcohol use has also been linked to an increased risk of developing alcohol use disorder.[7]

Tobacco and Vaping

Tobacco products (cigarettes, vaping products) are another frequently cited gateway substance.

Vaping specifically has seen rapid growth among teenage and young adult populations, and e-cigarettes are the most commonly used tobacco product among youth in the United States.[8] Nicotine has specific properties that affect the developing brain and could contribute to seeking additional substances later.[9]

Marijuana

Cannabis is one of the most widely used illicit substances among adolescents and young adults.[10]

It’s also one of the most extensively studied substances when it comes to the gateway hypothesis. As marijuana use has increased significantly with growing numbers of states legalizing marijuana, so too has debate surrounding whether marijuana serves as a gateway drug.

Is Marijuana a Gateway Drug?

Researchers remain split on whether marijuana is a gateway drug.

While several studies indicate that people who use marijuana are more likely to go on to use more serious drugs, many other researchers point to shared risk factors instead, such as a family history of addiction, mental health issues, or early exposure to substance use at home.[11] These factors, they argue, may better explain why some marijuana users eventually use other drugs, rather than marijuana itself causing the progression.

What does seem clear is that marijuana can cause dependency for some users, and continued adolescent cannabis use can affect memory, attention, and decision-making.[12] Regardless of whether marijuana functions as a “true” gateway, it poses significant risks that should be taken seriously by those who use marijuana regularly.

Why Adolescents and Young Adults Are Most at Risk

The human brain continues to develop well into someone’s mid-20s, particularly the prefrontal cortex region of the brain that is responsible for judgment and impulse control.[13] This makes adolescents and young adults more vulnerable to the effects of substances. They are also more likely to begin experimenting with substances due to peer pressure, curiosity, or a desire to fit in.

Family history also plays a role. A family history of addiction or alcohol use disorder increases a young person’s genetic and environmental risk of developing their own substance use disorder.[14]

Recognizing Signs of Substance Use Progression

Families and loved ones are often in the best position to notice early warning signs that substance use is progressing beyond mere experimentation.

The following signs suggest that substance use is progressing:

• A noticeable change in social circles, such as being reluctant to introduce friends to family members.
• Declining academic or job performance.
• Being secretive about whereabouts or who they associate with.
• Irritability, mood swings, changes in sleeping patterns
• Use of prescription medications that were not prescribed.
• Need for increasing amounts of the substance to achieve the same high.
• Withdrawal symptoms from substance use.

Identifying potential problems early gives family members the opportunity to intervene before a substance use disorder develops.

Getting Help: Treatment Options for Substance Use

If a loved one has progressed past a gateway drug to more serious drugs, or has developed a substance use disorder, there are numerous treatment options available.

Medical detox provides a safe environment to manage withdrawal symptoms with the assistance of licensed professionals. Outpatient treatment programs let the person continue their daily activities while receiving counseling. A number of treatment centers also offer psychiatric assessments and medication management for those who suffer from co-occurring mental health issues, since anxiety, depression, and other mental health issues commonly co-occur with substance use disorders.

If you are seeking a treatment center for yourself or a loved one, New Waters Recovery offers medical detox, residential treatment, and psychological assessments for people struggling with addiction and mental health issues. Each situation is unique, so our staff develops a personalized plan for each client based on their background, including previous use of gateway drugs that may lead to the use of more serious substances. If you or a loved one in the Raleigh, North Carolina, area would like to learn more about treatment options, please contact our admissions department so we can help you understand what treatment might look like for you.

Frequently Asked Questions About Gateway Drugs