I set my budget for $110 (two cartons of smokes, without tax) I researched till my eyes fell out. I rinsed them off, popped them back in, and found this forum and started reading till my eyes this time went on strike for higher wages. From this forum, I have found the best deals for me, and gave me a baseline of "expectations" of usage. I *feel* that I will use less than is "normal" but we will see.
my kr808d-1 from vaporjunction $30 (includes shipping)
my weekend deal from onestopdiyshop $30 (60ml of 36mg juice, 25ml of LorAnn flavor, etc) (includes shipping)
I smoke lights, and about a half pack a day (mileage varies daily, today, I have smoked 5) Will cut that down to 15mg, then most likely take and create lower strength "samples" to test with. Measuring and mixing are second nature to me, I cheffed (holy cow, that's a word!)for 20 years, and I love cooking for a hobby as well. So, the idea of infinite variations are a huge draw for DIM (doing it myself).
So, where was I? Oh, ok, so $72 spent on pure basics.
I dropped $12 at Perfumers Apprentice for some things I could not find anywhere else and *had* to have them, and I am dying to try out her stuff, and if it's good, I am hooked for life

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I will have 144ml of nicotine base (making 15mg per ml). At an 80/20 mix (80% base, 20% flavor) and the baseline of 3ml per day is 2.4ml of juice and .6ml of flavor 144/2.4= 60 days of vape juice.
How did I reach that?
36mg per ml in 60ml of base
36x60=2160
2160/target mg per ml (in my case, 15mg per ml) = 144
I will need to add 84ml of plain base (vg or pg or mix of those) to my 60ml of nic juice to get my target level.
Bear in mind, I have only spent $72 of my budget. If I smoke 1/2 pack per day, those two cartons would have lasted me 40 days. I am so far, 10 days ahead, and $50 to the positive. I can smoke more (stress days) which would be less days, making my savings more.
My kit comes with 5 prefilled cartomizers (I've no clue how long those will last, or, I may just give them to my son, or, I may clean them out and fill it with my mix, dunno yet.) I need to purchase some empty cartomizers for my mixes, and I want some spare parts. I can still spend my $50 and *still be ahead!
Regardless of all these numbers, I am saving my health. I already know what kind of an end I will have, watched my mom die of congestive heart failure (they blamed her smoking even though she stopped 40 years prior), and the sooner I stop these killers, the better off I will be, and that's worth it to me. I am sick of going outside in the blistering heat and melting while trying to have a smoke. I am sick of the icky smell on my clothes and the smell on my fingers, I gotta wash my hands after a ciggie. My doctor won't nag me anymore about it. Well, maybe suggest NA (narcotics anonymous) BWWAAHAHAHA!!!
I am pretty confident I have made a wise decision with it. I expect I will make a lot of mistakes and that is what happens to anything new...lol, I am cool with screwing up.
The more I explore it, the more I think this would be an awesome brick and mortar opportunity. Call it "Vapor Trails" or something cool.....hmmmm