Smok OSUB One Kit | All-in-One Sub Ohming

Today we review SMOK’s new AIO sub ohm starter kit, the OSUB One. Firing up to 50W, this unit has you covered for clouds and flavor. Read on for the full treatment.


Is that a hip flask or are you just happy to see me?

Smok, the brand more known for their billowing cloud machines and high-powered mods, have recently brought out the OSUB One kit. This diminutive all-in-one device will fit into the palm of your hand, weighs 240 grams, and is fashioned out of zinc alloy. The OSUB One features an internal 2200 mAh battery, inbuilt 2 mL e-liquid tank, (TPD compliant) and is firmware upgradeable. Its curved form reminds me of a flask, or an old-school Walkman. But enough about form – how does this AIO vape? Let’s find out!

Disclaimer: We received the Smok OSUB One Kit from Smok for the purpose of this review.

Smok OSUB One Kit Specs and Features

Kit Content

  • OSUB One mod
  • 2 x 0.2 ohm coil heads (recommended wattage range – 20 – 50W)
  • USB charging/upgrading cable
  • User manual
  • Spare o-rings


  • Height/length/width: 100mm x 55mm x 26mm
  • Weight: 240g
  • Material: zinc alloy
  • Battery: 2200mAh internal
  • Wattage range: 1 – 50W
  • Voltage range: 0.8 – 9V
  • Resistance range: 0.1Ω – 3Ω (VW) / 0.06Ω – 2Ω (TC)
  • Temperature range: 200F -600F / 100C – 315C
  • Tank capacity: 2mL
  • Driptip: 510 delrin
  • Available colors: black/green/stainless/white x gold/purple x gold/yellow

Notable Remarks

Getting started


All-in-ones. Often marketed as starter kits, they can be great for new vapers, or MTL vapers getting into sub ohm vaping. What they gain in convenience, they sometimes lose in compatibility. When you buy an AIO, you better make sure you love the tank, as well as the mod. And good looks alone won’t cut it, with so many options out there – it has to perform well too.

The first thing I noticed about the OSUB One kit is its heft. It fits really well in the hand, and has a good, solid weight to it – it doesn’t feel flimsy. Smok has opted for a clicky firing bar that runs along the side of the device, which is great ergonomically. You can grip the device in the palm of your hand and fire it either against your thumb/palm or with your fingers. Did Smok design a left-handed device here? I’m not sure, but as a leftie myself, it feels very natural to use.

The OSUB One kit features 0.2-ohm coilheads that look very similar to the Helmet Nano coils used in the Guardian 40W e-pipe kit. I wonder if the OSUB One kit is compatible with the higher resistance Helmet Nano coils? (Spoiler alert: they are. Read on to find out more.)

Even though this is a small AIO kit, Smok hasn’t skimped on the technical details. They have integrated their standard menu functionality into the OSUB One. You can track your puff number (and limit it if you so wish), choose from five different draw options, and switch between VW and TC modes.

Fill her up


The top-fill internal tank has a 2 mL capacity, in line with the EU’s TPD regulations. I think it’s great that Smok is reaching out to the European market. But can I just say: 2 mL sub ohming isn’t going to last you a long time. You are going to be refilling often – in my case, every 100 puffs or so. The top-fill system looks clean and offers a “no-leaking solution”, but crucially, there’s no marker for where to fill up to. I just chance it and fill to just below the juice slots with the coil still inserted.

How it performs


I started off with the included OSUB One 0.2-ohm coil from 20 – 50 watts as recommended, and vaped Cali-Yogo Strawberry (max VG) from Apollo. It will fire at 20 watts but it’s cool and short on flavor. My personal sweet spot was between 40 – 50W. At this point, clouds are impressive for an AIO, and flavor is rich. I really like the responsiveness of the airflow ring, as well as the choice of draw options.

My problems started with refilling. Without any fill markings it can be guesswork, plus the user manual isn’t clear on this. A couple of times I had issues with flooding and unpleasant, hot spitback. Although by the 5th draw and a bit of shaking, the coil had sorted itself out.

I was happy to find that my Helmet Nano coils (0.4 and 0.6 ohm) are also compatible with the OSUB One kit. That will widen your wattage range, as well as your replacement coil choices.

Finally, the 2200 mAh battery life is respectable for a device this size, and plugged into the USB slot of my laptop, went from empty to full charged within three hours.


  • Compact design
  • Great firing bar
  • Comprehensive menu and TC options
  • Compatible with Smok’s Helmet Nano coils
  • Decent battery life
  • Responsive airflow control
  • Leakproof – except for top fill flooding issues (more in cons)
  • Firmware upgradable


  • Tank capacity and wasted real estate?
  • No fill capacity markings
  • Easy to flood coil – lots of spitback if you’re not careful


I really like this little AIO from Smok. It offers compact, on-the-go sub ohm vaping up to 50 watts which is suitable with coils down to 0.2 ohm. For a small, AIO device the vapor production is great and flavor notes are authentic. I like the density of vapor with the airflow closed off at 2/3 out of 5.

What I would really fault is the lack of thought that went into the top-fill. Considering that you will be refilling quite often, it’s irritating to have to deal with coil flooding and hot spitback if you accidentally fill up too much. A simple marker built into the windows would have solved that problem in my opinion.

However, with different coil compatibility, acceptable battery life, and the possibility to upgrade the firmware, the OSUB One Kit from Smok is a keeper. This is a solid-performing, reliable little AIO for vapers new to sub ohm vaping, or for people who don’t need a three 18650 beast with them on the daily.

Meyrick Payne
Meyrick is an in-house content creator and contributor for Vaping360. Originally hailing from Melbourne, Australia, his vaping journey has taken him from Germany to Northern Ireland and Australia and back again. He is convinced that vaping is not only a healthier alternative to smoking, but also a great experience in and of itself. A passionate writer and artist, when he’s not unboxing and reviewing the latest devices, he’s probably collecting vinyl or shooting pics with his Spotmatic F.

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Got one myself about two three weeks ago. Got one myself after FINALLY finding a company who has/had (we’ll see if still available down the line) the OSUB One Replaceable Coil. Would not purchase until this mystery was temporarily (hopefully permanently) solved. Big up to Swagg out in Arizona for the whole kit and caboodle. Fast ass shipping too! As they say keep on vaping and enjoy!