Tobacco, Nicotine, and Acetylcholine Lecture Notes

Come to Marlboro Country
  - Advertising Slogan: Focus on flavor, enjoyment, and branded lifestyle.
  - Product Examples: Marlboro pack, Kendal Brown snuff, various brands of tobacco.
  - Health Warning: The product can damage health and is addictive.
  - Government Health Warning: Every packet carries a warning regarding addiction and health hazards.

Top 20 Drugs - Last 12 Months (N=78,819)
  - Statistics on Drug Use:
    - Poppers: 3.8%
    - Ritalin: 3.9%
    - Electronic THC: 3.9%
    - Mystery White Powders: 4.7%
    - Ketamine: 5.7%
    - Caffeine Tablets: 6.2%
    - Nitrous Oxide: 6.3%
    - Benzodiazepines: 7.8%
    - Opioid Painkillers: 8.7%
    - LSD: 10.1%
    - Magic Mushrooms: 10.6%
    - Amphetamines: 11.7%
    - Electronic Cigarettes: 12.3%
    - Cocaine: 16.4%
    - Shisha Tobacco: 18.5%
    - MDMA: 23.4%
    - Caffeinated Energy Drinks: 45.9%
    - Cannabis: 48.2%
    - Tobacco: 56.7%
    - Alcohol: 90.8%

Tobacco Species:
  - Nicotiana tabacum: Cultivated from South America.
  - Nicotiana rustica: Indigenous to North America.
  - Contents: Dried leaves contain approximately 6% nicotine, a potent alkaloid.
  - Complex Smoke Composition:
    - Contains nicotine, carbon monoxide, and thousands of particulates, some of which are carcinogenic.

Early British Colonies:
  - Tobacco was significantly cultivated in Virginia and widely used throughout the Americas for millennia.
  - Popularity in Europe:
    - Introduced in the 16th century through pipes and further developed as snuff in the 17th century.

Advertising Approaches:
  - Early ads emphasized doctor endorsements (e.g., "More Doctors Smoke Camels Than Any Other Cigarette") and promoted images of health and vigor.
  - Lucky Strike Campaigns:
    - Advertisements claimed its toasting process resulted in a product with “No Throat Irritation No Cough.”

Cigarettes Smoked Per Day Trends (1949-2010):
- Average daily smoking has decreased overall from both men and women throughout the decades.
- Men peaked at a higher smoking consumption than women.

Link to Education Levels:
- Higher education correlates with lower smoking rates; individuals without a high school diploma show the highest smoking prevalence.

Prevalence in British men and women (1961-1991) by socioeconomic status, highlighting disparities in smoking rates among different classes.

Price as a Determining Factor:
- Study shows that higher prices correlate with reduced smoking rates.
- Graphs demonstrate the relationship between consumption in billion pounds and real price index over time.

Consumption Statistics:
- Global cigarette consumption has shown growth since 1950, with notable consumption in countries like China, USA, and Russia.

Global Health Impact:
  - Tobacco is responsible for more than 5 million deaths annually, expected to rise to over 10 million by 2020, potentially killing over 1 billion throughout the 21st century.
  - Smoking Patterns:
    - Most initiation occurs during adolescence, with a significant percentage of smokers expressing a desire to quit.
    - The success rate for quitting is exceedingly low, despite high attempts at cessation.

Role in Cessation:
- E-cigarettes show promise in helping smokers cut down or quit; about 9% of smokers were successful in quitting after one year of e-cigarette use.

Routes of Administration:
- Inhalation is the most effective, delivering nicotine to the brain within about 7 seconds. - Oral nicotine has less effective absorption due to metabolic factors.
Nicotine Toxicity:
- The median lethal dose in adults is approximately 60 mg, with cigarettes delivering roughly 6-11 mg per unit.
- Symptoms of high doses include nausea, dizziness, and heart racing due to nicotine's action as a potent poison.

Metabolism:
- Primarily metabolized into cotinine via liver enzymes (cytochrome P450 2A6).
- Individual genetic variations impact nicotine dependency.
Cognitive Effects:
- Nicotine can enhance performance in tasks requiring attention and memory, despite the discomfort it may initially cause smokers.

Reinforcing Effects:
- Nicotine is self-administered, with behaviors strongly influenced by conditioned cues and the environment.
- Activation of dopamine systems in the brain (particularly in the NAc) is critical for reinforcing effects of the drug.

ACh Basics:
- Acetylcholine (ACh) is one of the first neurotransmitters identified, functioning within various neurological systems (CNS, PNS).
ACh Receptors:
- There are two classes: metabotropic (muscarinic) and ionotropic (nicotinic), influencing various physiological behaviors and neurological functions.
Influential Drugs:
- Various pharmaceuticals interact with ACh receptors, including agonists (muscarine, nicotine) and antagonists (atropine, curare).

Withdrawal Symptoms:
- Withdrawal can include irritability and difficulty concentrating, though these are not as pronounced as symptoms from other drugs like heroin.
Importance of Cues:
- Conditioned cues play a significant role in the smoking behavior and the challenges of achieving long-term abstinence.
Nicotine Replacement Therapy:
- Methods include gums, patches, and nasal spray; however, success in long-term cessation remains low regardless of methods utilized.