Shortfills Explained: Why UK Vapers Prefer Nic-Shot Customisation

In the evolving UK vaping landscape, shortfill e-liquids have rapidly become the preferred choice for vapers seeking greater control over flavour, nicotine strength, and value. Introduced as a direct response to post-TPD regulations, shortfills offer a flexible solution that allows users to customise their vaping experience.

As vaping devices continue to advance—with popular long-lasting options like Hayati Pro Max enhancing user expectations and convenient alternatives such as Prefilled Replacement Pods —many vapers appreciate how shortfills complement modern hardware by offering flavour variety and adjustable nicotine levels.

Unlike traditional 10ml nicotine-containing e-liquids, shortfills come in larger bottles filled partially with zero-nicotine liquid, leaving space to add a nicotine shot—or "nic shot"—to reach the desired strength. This adaptability has positioned shortfills as a cornerstone of the UK's modern vaping culture, particularly among intermediate and advanced users.

At their core, shortfills are 0mg e-liquids, typically 50ml in a 60ml bottle or 100ml in a 120ml bottle, designed with additional capacity so vapers can "short fill" the remaining space with a nicotine booster. Because shortfills contain no nicotine at the point of sale, they fall outside the TPD's 10ml restriction for nicotine-containing liquids.

This regulatory detail shaped the rise of shortfills in the UK, allowing consumers to enjoy larger bottles, better value, and longer-lasting supplies without sacrificing compliance.

Why Nic Shots Are Essential to Shortfill Customisation

A nicotine shot, commonly referred to as a "nic shot," is a 10ml bottle of concentrated nicotine, usually 18mg or 20mg strength, added to a shortfill to create a desired final nicotine level. Users can choose between two types of nic shots: freebase nicotine, which delivers a stronger throat hit, and nicotine salts, known for smoother absorption and faster satisfaction.

This choice enables UK vapers to tailor their e-liquid to their preferred sensation, whether they favour a punchier hit reminiscent of traditional smoking or a smoother, more refined draw. As refillable systems continue to evolve, many users compare these setups with prefilled pod vape devices to determine which format best suits their nicotine delivery preferences and daily vaping habits.

Adding a nic shot is straightforward: users empty the booster into the shortfill bottle, shake thoroughly to blend, and allow a brief steeping period for flavours to settle. For most vapers, mixing one 10ml 18mg nic shot into a 50ml shortfill produces a 3mg strength.

Adding two shots into a 100ml shortfill provides the same concentration. This flexibility allows complete control over nicotine intake—one of the primary reasons shortfills remain dominated by experienced vapers and sub-ohm users.

The Advantages That Make Shortfills a UK Favourite

Shortfills offer several benefits that have fuelled their popularity across the UK. The first is value for money. Larger bottles significantly reduce the cost per millilitre compared to repeatedly buying 10ml bottles. That's especially appealing to high-consumption vapers or those who enjoy experimenting with multiple flavour profiles.

Secondly, shortfills support greater flavour consistency. Unlike nic salts, which often prioritise smoothness, shortfills—particularly those with high VG ratios such as 70/30—produce richer vapour, making them ideal for dessert, fruit, and pastry blends. These flavour-dense liquids work especially well with mesh coils and sub-ohm tanks, which amplify the depth and complexity of multi-layered flavour profiles.

Another major advantage is customisable nicotine strength. Not all users want the same nicotine level, and shortfills give vapers the freedom to adjust according to cravings, device compatibility, and personal preference. That's especially relevant as many UK vapers transition gradually from higher nicotine levels to lower ones.

Shortfills vs Nic Salts vs Standard 10ml E-Liquids

Understanding how shortfills differ from other e-liquid types helps consumers make informed choices:

Shortfills: Typically high-VG blends (70/30 or 80/20), designed for sub-ohm, high-wattage devices. Best for cloud production and full-bodied flavour.

Nicotine salts: Smooth, fast-absorbing nicotine ideal for pod kits and MTL devices. Commonly available in 10mg and 20mg strengths.

Standard 10ml freebase liquids: Provide a sharper throat hit and work well with lower-power devices.

Each type serves a unique purpose, but shortfills remain unmatched in terms of flavour performance and customisation potential.

VG/PG Ratios and Their Influence on Shortfill Performance

Most shortfills use higher VG (Vegetable Glycerine) ratios to produce dense vapour clouds and smooth throat hits. High VG also helps enhance creamy, fruity, and dessert-style flavours. Meanwhile, Propylene Glycol (PG) carries the flavour and adds throat hit. Because shortfills often favour cloud production and flavour intensity, they tend to use more VG. That makes them ideal for sub-ohm coils but less suitable for low-power disposable vapes, which may struggle with thick liquids.

Avoiding Common Shortfill Mistakes

While shortfills are user-friendly, beginners sometimes make errors such as:

  • Not shaking the bottle thoroughly after adding a nic shot

  • Using shortfills in low-power pod devices

  • Adding too much or too little nicotine

  • Not allowing steeping time after mixing.

Correcting these issues ensures optimal flavour and consistency.

Are Shortfills Safe? Understanding UK Compliance

Shortfills must comply with UK regulations regarding ingredient quality, labelling, and MHRA notification. Although they are exempt from TPD nicotine bottle size rules, manufacturers must still meet rigorous standards for flavouring safety, packaging quality, and batch testing. Choosing reputable brands ensures that ingredients meet regulatory requirements and contain no banned additives.

Conclusion

Shortfills offer the perfect blend of flexibility, value, flavour performance, and regulatory compliance. Their ability to let users control nicotine strength—without sacrificing bottle size or flavour quality—makes them an attractive choice for UK vapers seeking personalised experiences. As vaping continues to evolve, shortfills remain an essential option for those who appreciate customisation and high-quality flavour.