I first started vaping about 5 years ago. Within a few months I found ECB's organic %100 VG line (alcohol-base flavors). That juice in a protank 1 or 2 was my favorite. I do realize a protank is basically just a very small MTL tank (4-wrap round 1.8 ohm tiny coil not a lot of vapor, and pin hole air flow, vs modern DTL cloud tanks are more likely to be harsh, but ECB isn't too much harsher in a big DTL tank like a TFV8). ECB in a protank 1 or 2 at 6mg, there was zero burn, zero throat hit, you could barely feel anything exhaling except for tasting flavor and that's how I liked to vape. When I try the ECB in a DTL big tank like a 10-coil TFV8, it's not as smooth or tasty but it's still smoother than even the 3mg stuff I DIY or even flavorless at 3-6mg, even vs ECB at like 12mg and extra flavor. Extra flavor (alcohol base) should only add to harshness. I have tried and tried and have never come close in DIY to the smoothness of the ECB %100 VG. I basically refuse to pay them $10 per 30ml if I can DIY for 25 cents. I pretty much can't vape anything PG, well I can, I'm not allergic but it's usually just bad even at 0mg and low flavor % that I pour it down the sink and DIY flavorless 3-6mg instead. I don't like the common 'fake' artificial PG flavors either which just taste fake even though 'natural flavors' are basically fake too (natural is basically the same final molecular structure but is made from compounds found in natural sources like tree bark, roots, berries, flowers or whatever - there just so happens to be flavor compounds in certain natural sources which when all engineered together trick the mind into thinking it tastes like banana or apple etc. The same thing how artificial flavors trick the mind into tasting like certain things, and artificial flavors are usually if not always derived from petroleum (yes, like gasoline), but are somehow actually often safer than 'natural flavors'. None the less, I don't really like PG flavors even at low %. For PG flavors, I've tried the most popular brands but I think they are garbage like Flavor West, Capella, etc, they are shjt to me usually. Alcohol based flavors are supposed to be more harsh than PG flavors but boggles me how ECB's %100VG line is alcohol based. I have tried a lot of Medicine Flower aka lotus flavors CO2 extracted flavors and those ARE derived from the actual flavor on the bottle (banana is CO2 extracted) but those flavors are rather harsh as well compared to ECB's alcohol based. The liquid in CO2 flavors, I guess is water. I asked medicine flower what the liquid base is and they said nothing is added to it, so I guess it's the water content in the fruit or whatever the flavor is (water in strawberry, banana etc). None the less, the Med flower flavors are not that smooth even at 0mg. I did so many emails with ECB trying to trick them into telling me their flavor source but have not found out. Made a bunch of threads about it also but never concluded. You would think I should just buy some e cig alcohol based flavors and see which taste like ECBs. There aren't even many alcohol based flavors to choose from to pin point the ECB source. So what I originally did was buy a lot of Nature's Flavors (NF) alcohol based flavors. ECBs organic %100 VG line, they even copy pasted the exact same description that NF originally uses for their organic natural alcohol based line (which is ok'd for vaping by NF [NF had a sister site years ago dedicated to vaping but have deleted it maybe for liability or something, but they will tell you some of their flavor lines like the alcohol based and without diacetyl are safe for vaping and are the same flavors they had for their vaping site). ECB copied this from NF. NF is a huge flavor supplier for baking etc, e cig is just a small % of their market: These water-soluble flavorings are Certified Organic, All-Natural, Kosher, Vegan, Gluten Free, and contain No Allergens. These flavors have no nutritional value as used in this application are calorie, carb, and sugar free. There is no fat. Enjoy. But I can tell you, if I mix NF even at 0mg, it's way more harsh than ECB at 6mg. Then there's the whole 'if I add even just 3mg, it becomes like a trick-juice that makes you cough' which is a whole nother problem. ECB has certain uncommon flavors that I have scoured the internet trying to find as alcohol based by any other flavor manufacturer but the only ones I could find that make these following flavors in an alcohol base are NF: Organic gooseberry flavor organic cantaloupe flavor Organic pomegranate flavor Organic japanese plum flavor so, again, all things point to that ECB simply gets their flavors from NF but I literally throw away NF because I find it usually disgusting and harsh. I have tried to 'let the alcohol evaporate with the flavor bottle cap off' but that did nothing. I tried heating up the glass bottles of NF with the cap off, but that did nothing. I have tried to let the NF steep for weeks/months but that did nothing. At this point, IDGAF if I find the exact same flavor source that ECB uses, I just want smooth flavor. I would prefer it not to be possibly unsafe though, but artificial is often safer than 'natural' and the CO2 Medicine Flower I think also has a bunch of other possibly not-so-safe processes it goes through besides just CO2 extraction. The main flavor I tried testing was banana which was my favorite ECB but didn't come close using NF's banana. From scouring the internet, I have found only a couple other alcohol-based banana manufacturers besides NF, but as I mentioned, the NF seems way harsher so I don't think it's what ECB uses, and the other banana flavors I found don't really seem like where ECB would get theirs such as this: Banana Extract Wonf, Natural (Organic NOP) by A.M. Todd Botanical Therapeutics - Food, Beverage & Nutrition And even if ECB did get their banana flavor from link above, the following flavors I can't find ANYWHERE with an alcohol based besides from NF, so I highly doubt ECB chose to get some flavors from NF and others from somewhere else such as the link above. The flavors I can ONLY find as alcohol based from NF and ECB has these flavors also: Organic gooseberry flavor organic cantaloupe flavor Organic pomegranate flavor Organic Japanese plum flavor Ultimately, I don't care if it's not ECB's flavor source though, I just want smooth flavor. I still haven't tried VG-based flavors though which might be zero-burn even though they require a lot % to be flavorful. But then there's the whole thing about nicotine.. At around $10 a 30ml, ECB isn't exactly high-end juice, so I don't think they're using expensive nicotine such as Carolina Extract which is the only one I think I haven't tried but is supposedly the smoothest (not counting nic salt). I have tried pretty much every brand of nicotine (RTS, ecigexpress, vaporstek, wizard labs, etc) but even those mixed 100VG flavorless seem much harsher than the ECB with extra flavor (extra alcohol base). I used those nic brands fresh from delivery but still seems harsher. Recently I found out about nic salt being super smooth, so I said great! This should do the trick. I just received a 60ml bottle of VG based nic salt from Nicotine River (their smoothest salt version of the 3 choices) and it is possibly THE WORST, most harsh, weird tasting nic I have ever used even flavorless at 6mg. I measure everything with a syringe and is indeed just 6mg in a single coil GOVAD RTA but tasted so bad and just made me cough. Whenever I vape any brand of nicotine weather it be salt or regular freebase, at over like 12mg or even 6mg it's like I'm vaping trick juice that is meant to fool someone into coughing and so I just smoke 1/4 of a cigarette instead. Don't get me wrong, I still vape mostly but when everything was fine and dandy with the Protank 1 and 2 and 6mg ECB, I PREFERRED TO ALWAYS vape and would only have 1 cigarette a month. Sometimes the vape cough reaction is worse than others. In the mourning I can't vape even 3mg flavorless, but 1/4 a cigarette is smooth.