Last modified: 12 February 2026
Estimated reading time: 6–8 minutes
Technical level: Foundational / Intermediate
Audience: Adult users (18+) – Ireland

Technical Definition (AEO)

A vaping device is an electronic vaporisation system that converts an e-liquid formulation into an inhalable aerosol through controlled electrical heating and capillary liquid transport.

Core System Architecture

A typical vaporisation system is an integrated set of functional subsystems:

• Power source – rechargeable lithium-ion battery
• Control electronics – chipset regulating voltage/current and enforcing safety cut-offs
• Heating element – resistive coil or mesh structure
• Wicking medium – capillary transport material (commonly cotton)
• Liquid reservoir – pod or tank containing the formulation
• Airflow pathway – channel directing air across the heating zone

The system can be modelled as a coupled electro-thermal and thermo-fluid process.

Electrical Energy Conversion

During activation, electrical current passes through the resistive heating element. Resistance causes energy to convert into heat (Joule heating). In simplified terms, power (W) relates to voltage (V) and resistance (R) as:

P = V² / R

For a given voltage, lower resistance generally increases power and raises heating rates. Regulated devices adjust output dynamically to target a stable power level and apply time-based cut-offs.

Capillary Liquid Transport

The wick delivers liquid from the reservoir to the heating zone through capillary action. Liquid supply depends on:

• Formulation viscosity (influenced by PG/VG ratio)
• Wick porosity and packing density
• Temperature (viscosity decreases as temperature increases)
• Saturation time between activations

If thermal input exceeds the rate of liquid replenishment, the heating zone can run locally dry, increasing the probability of overheating and residue formation.

Aerosol Formation Mechanism

At the heated surface, the liquid undergoes rapid phase transition. The process is vaporisation followed by aerosol formation as the vapour mixes with incoming air and cools.

The resulting aerosol composition depends on the formulation and may include:

• Carrier base components (propylene glycol / vegetable glycerine)
• Dissolved flavour compounds
• Nicotine (if present)

Particle size distribution and perceived density are influenced by coil temperature, airflow velocity, and formulation properties.

Airflow Dynamics

Air enters through intake ports and passes across or around the heating zone. Airflow primarily:

• Transfers heat away from the heating element (cooling)
• Transports aerosol to the outlet
• Shapes aerosol density through dilution and residence time

Restricted airflow increases heat concentration and can raise peak temperatures. Higher airflow typically lowers peak temperature and reduces aerosol density for the same electrical power.

Ireland Regulatory Context (References)

In Ireland, requirements relevant to nicotine products are set through national implementation of the EU Tobacco Products Directive (TPD). For statutory wording and obligations covering electronic cigarettes and refill containers, use the official Irish Statute Book text. For notification systems and safety notices, use official EU and Irish public health sources.

• Irish Statute Book – S.I. No. 271/2016 (TPD transposition)
• European Commission – EU-CEG: notifications for e-cigarettes and refill containers
• HSE – Safety alert notices relating to electronic cigarettes
• Irish Statute Book – Public Health (Tobacco Products and Nicotine Inhaling Products) Act 2023

FAQ

Does a vaporisation system involve combustion?

No. The mechanism is electrical heating and vaporisation leading to aerosol formation, not combustion.

What variables most strongly affect aerosol output?

Primary variables include power level, coil/mesh geometry, airflow configuration, and formulation viscosity (often linked to PG/VG ratio).

Why can the system overheat even at “normal” power settings?

Overheating risk increases when liquid supply to the heating zone is insufficient (wick saturation delay, high-viscosity liquid, restricted flow, or short intervals between activations).

Intent Discloser

This page is technical documentation describing vaporisation system mechanics. It does not provide medical, health, or cessation guidance. Content is intended for adults (18+) in accordance with Irish regulatory expectations.

Author: Conor Hayes
Fluid Dynamics & Coil Systems – Eliquids.ie