SMOK Osub 40W Kit Review

The SMOK Osub 40W kit is a small, full featured, anti-tube mod and tank that’s hiding things from you.


SMOK Osub 40W kit Intro

The SMOK Osub kit is a 40W full featured VW/TC mod with an internal 1350mAh battery and color matched Helmet tank that is absolutely tiny – it easily fits in the watch pocket (coin pocket, former Zippo lighter pocket, whatever you prefer) of your favorite jeans. The Osub is also easily palmed for a stealth vape.

The Osub is a clean looking mod with a hidden fire button that is concealed by a C-shaped firing key attached to the side of the mod with magnets – you simply squeeze the mod and it fires. The smooth, rounded firing key is easily removed if you want to use the mod without it, and it also hides the USB charging port.

The side mounted OLED is small but legible with the icon-driven menu system, and the +/- buttons are located directly below. As with many mods you can rotate the screen to to your preference, and lock the mod by pressing +/- buttons simultaneously.

The black and silver review sample is a really elegant looking mod with the color matched Helmet tank, and the kit has a nice heft which gives it a quality feel for such a miniature device. The Osub is also available in black with gold trim, silver, and white.

SMOK Osub 40W kit Specs and Features

Kit Content

  • Osub 40W mod
  • Helmet tank
  • One 0.4Ω clapton dual core coil (installed)
  • One 1.0Ω clapton single core coil
  • USB cable
  • Spare parts
  • User manual


  • Size: 22 x 35 x 70mm
  • Weight: 116g
  • Material: Zinc alloy
  • Standby current: 50µA
  • Battery capacity: 1350mAh
  • Voltage output: 0.8-9V
  • Output power: 1-40W (VW) / Max 50W (TC) (Ni/SS/Ti)
  • Resistance range VW: 0.1-3Ω
  • Resistance range TC: 0.06-3Ω
  • Temperature range: 200-600℉ / 100-315℃

Specifications (Helmet tank)

  • Size: 22 x 50mm
  • Weight: 53.5g
  • Material: Stainless steel
  • Capacity: 2ml

Notable Remarks

A rant...sort of


The Helmet tank is childproof (push-to-turn), leakproof, and capacity is limited to 2ml, making it EU compliant.

Every time I encounter a 2ml tank I think it might be too small for some people. I understand that EU TPD guidelines limit capacity, and I am thrilled to see SMOK (and others) complying to make gear available in the EU, but I would like to see them at least offer a larger tank in other markets where legal.



Like many of us, I’ll admit that I don’t always read directions. It’s ironic because in my former life as a technical writer that’s pretty much all I wrote. Go figure.

Anyway, after opening the Osub kit I turned the mod over in my hands several times looking for the USB port – and found none. With an internal battery I knew it had to have one, so I hooked the edge of the firing key and gently tugged. The magnetic key fell away and the Osub revealed its secret: the port is hidden. Pretty cool.

Moving on, I charged the mod, filled the tank, and explored the menus. Like other SMOK mods the Osub features intuitive menu icons. Press the firing key three times quickly to enter the setup and operation menus. You then scroll through the various icons with the +/- buttons.

The Osub has seven icons, with sub-menus:

  • VW/TC mode select
  • TC coil selection (Ni/Ti/SS) and TCR
  • Screen timeout (5-240 seconds)
  • Puff counter
  • Screen rotation
  • Initial resistance adjustment
  • Power off

I set the output to VW mode and with the preinstalled 0.4Ω clapton dual core coil set to 25W, the vape was perfect for me – nice vapor and flavor with a bit of warmth.

This is the second review I’ve done on a kit with the Helmet tank, and I’m really liking it. The tank is simple to use and fill and I have never experienced any gurgles, spitting or leaks – just nice flavorful vapor. The top airflow adjustment ring is simple and stays put, at least until you need to refill.

Regarding battery life, at 25 W with the 0.4Ω dual coil, I was able to get about 116 puffs of approximately 3.6 seconds in duration, which translates to roughly 10 vaping sessions of 11 drags before the battery quit. That’s not too bad for a tiny mod and I would expect even more from the 1.0Ω single coil.

As a final test, I built an RDA with a 0.1Ω Ni 200 coil to put the Osub through a brief TC vape session and the mod performed as expected.


  • Size/weight
  • Clean design aesthetics
  • Magnetic fire key
  • Vapor and flavor production
  • Intuitive icon-driven menus


  • Small tank capacity


Honestly, I haven’t put the Osub down since I started using it several days ago. It’s not an all day device with the smallish battery and tank capacity but Osub kit has taken a prominent slot in my daily rotation. I love – LOVE – the feel and operation of the firing key. It has a smooth tactile feel and easily fires with a simple squeeze; and the kit slides easily into and out of my pocket. I know there are probably smaller mods available but I really like this one. It looks great and the weight adds to the quality feel.

Oh, and the vape is pretty darn good too.

If you are looking for a small mod that isn’t a tube shaped Ego on steroids – and does temp control too – the Osub 40W kit might be a perfect choice.

Gary Joseph
Gary is a retired technical writer residing in the metro Detroit area. Besides vaping, and writing for Vaping360, some of his other interests include motorcycling, watch collecting, bicycling and fitness.

Add comment

E-mail is already registered on the site. Please use the Login form or enter another.

You entered an incorrect username or password

Sorry that something went wrong, repeat again!