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Related Concept Videos

Stimulants01:29

Stimulants

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Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
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Vaporization01:18

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The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Updated: Dec 5, 2025

Generation of Electronic Cigarette Aerosol by a Third-Generation Machine-Vaping Device: Application to Toxicological Studies
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An update on controversies in e-cigarettes.

Jayesh Mahendra Bhatt1, Manisha Ramphul1, Andrew Bush2

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Paediatric Respiratory Reviews
|October 19, 2020
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Summary
This summary is machine-generated.

Electronic nicotine delivery systems (e-cigarettes) pose significant health risks, particularly to youth. Vigorous anti-vaping legislation is urgently needed due to unknown long-term toxicity and acute harm.

Keywords:
E-cigarettesEVALIToxicityVaping

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Area of Science:

  • Public Health
  • Toxicology
  • Respiratory Medicine

Background:

  • Electronic nicotine delivery systems (e-cigarettes) are marketed as safer alternatives to tobacco smoking.
  • E-liquids contain nicotine, humectants, flavorings, and potentially harmful adulterants.
  • There is a notable increase in e-cigarette use among youth in the USA and Europe.

Purpose of the Study:

  • To review contrasting views on e-cigarettes from the tobacco industry and professional societies.
  • To examine the epidemiology of e-cigarette use, focusing on youth trends.
  • To discuss the toxicity and mechanisms of e-cigarette or vaping associated lung injury (EVALI).

Main Methods:

  • Literature review and synthesis of existing data on e-cigarette use and health effects.
  • Epidemiological analysis of youth e-cigarette usage patterns.
  • Review of toxicological studies and clinical case reports related to EVALI.

Main Results:

  • Widespread and significant rise in youth e-cigarette use observed in the USA and Europe.
  • EVALI is characterized by respiratory failure and intense inflammation, with diverse clinical presentations.
  • Secondhand exposure to e-cigarettes is harmful via respiration and transdermal absorption.
  • E-cigarettes exhibit worse acute toxicity than traditional tobacco, with unknown long-term effects.

Conclusions:

  • Clinicians should consider vaping as a potential cause for unexplained respiratory illnesses.
  • E-cigarettes present acute toxicity risks and unknown long-term dangers.
  • Immediate and robust anti-vaping legislation is advocated for public health protection.