Most people that I have talked to have reported that they have started at 24-28 mg/ml.
This is what I started at and it has been fine for me. I used to smoke 1/2 pack a day, so you may need to up the dosage a little at first.
Just a little bit of unsolicited advice, you WILL want to get a hold of several different blends and strengths to start out. Finding your particular flavor is pretty much the most important part of falling in love with vaping. You don't necessarily need higher strength, you'll just end up vaping more to reach the point of satiety.
In case you were wondering what the upper limit of mg/ml is, 38-48mg/ml is what STRONG is considered although I have personally tried 50mg/ml while doing a DIY mix. People have reported vaping a drop or two of 100mg/ml but I haven't heard anyone say they particularly enjoyed it, 50mg/ml usually results in a large headache after several puffs.
So to put everything in a nutshell, your personal preferences in taste are of greater importance than anything, as such you should budget for experimentation.
My personal advice is to start at or around 20-30 mg/ml and have a extra spare CHARGED battery around at all times in the event that your personal nicotine need outweighs the batteries ability to feed it.
You'll soon find your groove.
GL and happy vaping,
-Dee
