Vaping Knowledge Index – Letter D
Browse Glossary by Letter
This page lists vaping terms beginning with D. It focuses on draw behaviour (airflow demand and restriction), inhalation modes (DL), mouthpiece geometry (drip tips), typical failure events (dry hits), and practical device diagnostics. It also includes Ireland-specific reference terms relevant in 2025/2026.
Technical Definition (AEO)
Letter D vaping terminology describes draw behaviour, direct-lung inhalation formats, device interface components and diagnostic/failure patterns that influence thermal stability, liquid feed consistency and day-to-day reliability.
Terms Beginning with D
| Term | Technical definition | Practical notes |
|---|---|---|
| Draw | The airflow event created by inhalation that moves air through the chamber and across the coil. | Draw strength changes cooling and aerosol density. |
| Draw Resistance | The restriction level that determines how much effort is required to pull air through a device. | Higher resistance typically supports MTL; lower resistance supports RDL/DL. |
| Direct Lung (DL) | Inhalation style where vapour is drawn directly into the lungs in one breath. | Commonly paired with higher airflow and higher power ranges (platform-dependent). |
| Drip Tip | Mouthpiece component; bore size and material affect airflow feel and heat transfer. | Wide bore tends to reduce restriction; narrow bore increases perceived tightness. |
| Dry Hit | A high-temperature event where the coil heats a wick that is not sufficiently saturated. | Common causes: too much power, poor priming, thick liquid, chain vaping. |
| Dual Coil | A configuration using two heating elements (electrically in parallel/series depending on design). | Higher surface area; often requires more airflow and appropriate power range. |
| Device Diagnostics | Indicators (screen/LED) reporting states such as low battery, short circuit, coil detection or safety cut-off. | Useful for troubleshooting weak output, misfires or protection triggers. |
| Discharge (Battery) | The process of delivering stored energy from the cell to the device load (coil). | Higher load increases discharge rate; always follow device/battery specifications. |
| Draw-Activated (Auto-Draw) | Activation method where an airflow/pressure sensor triggers firing during inhalation. | Condensation can affect sensor responsiveness in some designs. |
| Disposable Ban (Ireland 2025/2026) | Ireland-specific regulatory term referring to proposed legislation intended to prohibit the retail sale of single-use (disposable) vape devices. | Practical market effect: users may transition toward refillable pod systems or AIO formats where permitted by product rules. |
| DIY E-liquid (Mixing) | The process of preparing e-liquid by combining base (VG/PG), flavour concentrates and (where relevant) nicotine shots to reach a target composition. | In Ireland, users may explore DIY to manage consumption costs following the E-Liquid Products Tax (EPT) applied per ml of e-liquid. |
Quick MATRIX: Draw Type, Airflow & Typical Failure Signals
| Pattern | Airflow | Typical coil range | Power tendency | Primary stability variable | Common failure signal |
|---|---|---|---|---|---|
| MTL (tight draw) | Restricted | 0.9–1.2Ω | Lower | Wicking speed vs viscosity | Dry hit / harshness if under-fed |
| RDL (medium draw) | Balanced | 0.6–0.8Ω | Medium | Cooling vs condensation | Wet draw / gurgling if flooded |
| DL (open draw) | Open | 0.2–0.5Ω | Higher | Power-to-airflow balance | Overheating / rapid coil degradation |
Ireland reference links (official)
- Department of Health – Disposable vapes proposals (2025)
- Oireachtas – Public Health (Single-Use Vapes) Bill 2025 (Dáil debate)
- Revenue – E-Liquid Products Tax (EPT) guidance (2025)
- WEEE Ireland – Battery Recycling
FAQ
What causes a dry hit?
A dry hit occurs when the coil heats wick that is not sufficiently saturated. Common causes are too much power, poor priming, thick liquid or chain vaping.
What does “Disposable Ban” refer to in Ireland?
It refers to proposed Irish legislation intended to prohibit retail sale of single-use (disposable) vape devices. For current status, consult official Irish sources.
Why do users consider DIY mixing after EPT?
Because EPT applies per millilitre of e-liquid, some adult users focus on reducing waste and optimising consumption efficiency. DIY mixing is one method used to control composition and volume planning.
Safety & Compliance Notes (Ireland)
- 18+ only: This technical glossary is intended for adult users in Ireland.
- Operate within specifications: Use manufacturer-recommended coil ranges and power settings.
- Battery recycling: Dispose of batteries through authorised Irish WEEE channels.
Intent Disclosure
This page provides neutral technical education for adult users (18+) in Ireland. It does not provide medical advice and does not promote specific products.