Personal experience - on modern gear, anything over 3mg was fucking painful. So I stuck to 3mg. And went through a shitload of juice. If you have to, vape constantly. But it can be done. Don't expect to never touch another smoke from the minute you start vaping. Some people do that, others will take time to transition. But... if you get a flavor of juice you like enough, it'll taste so much better than smoking ever did, and if you do slip up on occasion, the experience will be bad enough you'll wonder why you lit up.

And yeah, your math is about right.

Your math is correct.

Try the 2.5 to 3mg range first. If you feel like you arent being satistfied, then add more nic to it.

We cant really tell you exactly what range to use, simply because we dont know your vaping habit. Some people want 2 or 3 quick puffs. Some would rather take puffs for 5 minutes and socialize etc on a smoke break.

I started with too much nic myself a year ago, and dont want that for you.

The other thing you need to think about is whether you are a DTL or MTL vaper. 3mg is about okay for DTL. For MTL you probably want 6+mg.

What equipment do you have?

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If you get 100mg/ml nic it makes the math much easier. Your equipment determines how strong the nic should be. The more juice it vapes in a hit the lower you want the nic. My main setup is dual coils in a griffin at about 40w, 5mg works for me in that. In an old single coil / battery mtl setup I use 10mg, but I'd probably make it higher if I used it more often. I get less from it even though the concentration is doubled. Make a few small batches at varying strengths to figure out the right amount, so you don't get a big bottle that's too weak or strong.

In the future, please use the questions thread or juice calculator.

I suggest you use two different levels of nicotine.

When I made the switch I used two tanks - one with 12mg/ml and the other with 3mg/ml. I primarily vaped the 3mg. But at certain times when the nicotine craving was super strong (first thing in the morning, after dinner, etc) a few puffs on the 12 mg helped keep me off the cancer sticks.

The higher nic is much harsher, but not unbearable - and MUCH better than smoking. You might want to look into Nic Salts for something with a higher nic.