Drug Classifications: Alcohol and Nicotine

Overview of Drug Types

Drugs are substances that alter physiological or psychological functions in the body. Alcohol and nicotine are classified as psychoactive substances due to their effects on the central nervous system.

• Alcohol: A depressant that slows down brain activity and impairs motor function.

• Nicotine: A stimulant found in tobacco products, affecting the brain's reward system.

  Both and all drugs affect the brain's reward system and make it dependent on the drug over time.

Blood Alcohol Concentration (BAC)

Definition and Influencing Factors

BAC is the percentage of alcohol in a person's bloodstream. It is used to measure intoxication levels.

• Influencing Factors: Body weight, gender, rate of consumption, food intake, and metabolism.

• Legal Limits: In most U.S. states, the legal BAC limit for drivers aged 21 and over is 0.08%. For drivers under 21, the legal limit is 0.

Drug Dependence

Definition

Drug dependence is a condition in which an individual requires a drug to function normally and experiences withdrawal symptoms without it.

• Physical dependence: The body adapts to the drug, leading to tolerance and withdrawal.

• Psychological dependence: Emotional or mental need for the drug.

  Withdrawal symptoms of drugs are the opposite of the body on the drugs. Ex. With alcohol, someone might feel tired and euphoric, and without it, someone might feel anxious.

Vaping and Dangerous Additives

Risks Associated with Vaping

Vaping devices may contain harmful additives. Vitamin E acetate is a dangerous additive linked to lung injury (EVALI).

• EVALI: E-cigarette or Vaping Product Use-Associated Lung Injury, a serious condition caused by inhaling certain additives.

Nicotine and the Brain's Reward System

Mechanism of Action

Nicotine stimulates the release of dopamine in the brain, activating the reward pathway and reinforcing drug-taking behavior.

• Reward system: Involves the mesolimbic dopamine pathway, which is associated with pleasure and reinforcement.

Laboratory-Produced Nicotine

Synthetic Nicotine

Synthetic nicotine is produced in laboratories and is chemically identical to natural nicotine but not derived from tobacco plants.

Alcohol and Nicotine: Effects on Brain and Body

Physiological and Neurological Effects

• Alcohol: Depresses the central nervous system, impairs judgment, coordination, and can damage organs with long-term use.

• Nicotine: Stimulates the nervous system, increases heart rate, and can lead to addiction and cardiovascular issues.

E-Cigarette Neurological Targets

Brain Regions Affected

E-cigarettes deliver nicotine, which targets nicotinic acetylcholine receptors in the brain, affecting areas involved in reward, learning, and memory.

Tolerance

Definition

Tolerance is the need for increasing amounts of a drug to achieve the same effect due to physiological adaptation.

Drug Administration Methods and Effects

Routes and Impact

• Oral: Swallowed and absorbed through the digestive tract; slower onset.

• Inhalation: Absorbed through the lungs; rapid onset.

• Injection: Directly into bloodstream; fastest and most potent effects.

• Transdermal: Absorbed through the skin; gradual onset.

Alcohol and Fetal Exposure

Mechanism

Alcohol can cross the placenta and reach the fetus, potentially causing Fetal Alcohol Spectrum Disorders (FASD).

Long-Term Drug Use Effects

Chronic Health Consequences

• Alcohol: Liver disease, cardiovascular problems, neurological damage.

• Nicotine: Cancer, heart disease, respiratory issues.

Drugs and the Reward System

Neural Mechanisms

Drugs increase dopamine release in the brain's reward system, leading to reinforcement and potential addiction.

Nicotine Use Among Teens

Most Common Products

• E-cigarettes (vapes): The most widely used nicotine product among teens.

EVALI

Definition and Symptoms

EVALI is a lung injury associated with vaping, characterized by cough, shortness of breath, and chest pain.

Nicotine Addictiveness Compared to Cocaine and Heroin

Relative Addictiveness

Nicotine is highly addictive, with dependence potential comparable to cocaine and heroin, though mechanisms and withdrawal symptoms differ.

Neural Basis for Addiction

Brain Changes

Addiction involves changes in brain structure and function, particularly in the prefrontal cortex and reward pathways.

Drug Effects on Teens

Adolescent Vulnerability

• Brain development: Teens are more susceptible to addiction due to ongoing brain maturation.

• Health risks: Increased risk of cognitive impairment, mental health issues, and long-term dependence.

Summary Table: Drug Administration Methods

Key Equations

BAC Calculation:

where r is the alcohol distribution ratio (0.68 for men, 0.55 for women).

Dose-Response Relationship:

*Additional info: Academic context and definitions have been expanded for clarity and completeness.*