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Related Concept Videos

Stimulants01:29

Stimulants

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.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
Electron Carriers01:24

Electron Carriers

Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Vaporization01:18

Vaporization

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...
Electron Behavior00:54

Electron Behavior

Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
Electrochemical Cells01:28

Electrochemical Cells

Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not electrons—to...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.

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Related Experiment Video

Updated: May 7, 2026

A Microcontroller Operated Device for the Generation of Liquid Extracts from Conventional Cigarette Smoke and Electronic Cigarette Aerosol
09:30

A Microcontroller Operated Device for the Generation of Liquid Extracts from Conventional Cigarette Smoke and Electronic Cigarette Aerosol

Published on: January 18, 2018

Electronic cigarettes: a short review.

J F Bertholon1, M H Becquemin, I Annesi-Maesano

  • 1Laboratoire de Granulométrie et de Dépôt des Aérosols, Assistance Publique Hôpitaux de Paris, Paris, France.

Respiration; International Review of Thoracic Diseases
|October 2, 2013
PubMed
Summary
This summary is machine-generated.

Electronic cigarettes (e-cigarettes) are controversial smoking cessation aids. While short-term toxicity appears low, long-term effects and efficacy for quitting smoking remain unproven due to unknown composition and contaminants.

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Comparing the Effects of Electronic Cigarette Vapor and Cigarette Smoke in a Novel In Vivo Exposure System

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Generation of Electronic Cigarette Aerosol by a Third-Generation Machine-Vaping Device: Application to Toxicological Studies
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Generation of Electronic Cigarette Aerosol by a Third-Generation Machine-Vaping Device: Application to Toxicological Studies

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Related Experiment Videos

Last Updated: May 7, 2026

A Microcontroller Operated Device for the Generation of Liquid Extracts from Conventional Cigarette Smoke and Electronic Cigarette Aerosol
09:30

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Published on: January 18, 2018

Comparing the Effects of Electronic Cigarette Vapor and Cigarette Smoke in a Novel In Vivo Exposure System
10:44

Comparing the Effects of Electronic Cigarette Vapor and Cigarette Smoke in a Novel In Vivo Exposure System

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Generation of Electronic Cigarette Aerosol by a Third-Generation Machine-Vaping Device: Application to Toxicological Studies
08:39

Generation of Electronic Cigarette Aerosol by a Third-Generation Machine-Vaping Device: Application to Toxicological Studies

Published on: August 25, 2018

Area of Science:

  • Public Health
  • Toxicology
  • Addiction Medicine

Background:

  • Electronic cigarettes (e-cigarettes) marketed since 2004 as nicotine alternatives and smoking cessation tools.
  • Despite widespread use, e-cigarettes have undergone limited experimental study.
  • Significant controversy surrounds their safety and efficacy.

Purpose of the Study:

  • To review current knowledge on electronic cigarette composition, toxicity, and smoking cessation effectiveness.
  • To highlight gaps in experimental data and clinical evidence.

Main Methods:

  • Literature review of existing studies on e-cigarette ingredients and effects.
  • Analysis of reported chemical compositions and detected contaminants.
  • Assessment of available short-term toxicity data.

Main Results:

  • E-cigarette fluid ingredients (propylene glycol, glycerol) are generally considered safe in other contexts.
  • E-cigarette fluid composition is often not accurately labeled, with variable additives (nicotine, flavors).
  • Contamination with various chemicals has been detected; short-term toxicity appears low.

Conclusions:

  • Long-term toxicity of e-cigarettes is currently unknown.
  • The clinical effectiveness of e-cigarettes for smoking cessation requires further established proof.
  • Inconsistencies in product composition and potential contaminants warrant caution.