Use of tobacco by indigenous Americans
Used for religious and spiritual rituals.
Tobacco introduced to Europe
By Columbus in the late 15th century.
20th-century tobacco propaganda
Promoted smoking as glamorous and healthy.
Public health challenges today
Smoking-related diseases and addiction.
Nicotine's action in VTA
Activates α4β2* receptors, releasing dopamine.
Nicotine's effect on dopamine
Stimulates release in the nucleus accumbens.
Nicotine's effects
Enhances pleasure, concentration, reduces anxiety.
Withdrawal symptoms peak
Within 3 days, lasting up to 1 month.
Long-term cravings
Can persist for years after quitting.
Nicotine's mood effects
Inhibits monoamine oxidase, elevating neurotransmitters.
Harmful substances from combustion
Arsenic, benzene, cadmium, cyanide, formaldehyde, tar, CO, nitrogen oxides.
Menthol in tobacco
Acts as a cooling agent, may produce toxic compounds when burned.
Ammonia in smoke
Enhances nicotine absorption, increasing addiction.
Nicotine pharmacokinetics
Rapid absorption; half-life α=1.35h, β=17h; metabolized by CYP2A6.
Nicotine replacement therapy
Provides controlled nicotine to reduce withdrawal.
Timing of NRT initiation
When patient is ready to quit.
Forms of NRT
Patches, gums, inhalers, pastilles, vaporizers.
Pharmacological treatments
Varenicline and bupropion modulate addiction pathways.
Behavioral support role
Enhances cessation success through counseling and motivation.
Factors in treatment choice
Dependence level, health, preferences, comorbidities.
Teste tes connaissances avec un QCM de 10 questions sur Understanding Tobacco: History, Pharmacology, and Cessation.
1. What was the primary role of tobacco in indigenous American societies?
2. How does nicotine's activation of α4β2* nicotinic receptors in the ventral tegmental area (VTA) contribute to its addictive potential?
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