Adding another RY4 review to the already very long list. I was given a 10ml sample of Black Label RY4 (70VG/30PG 18mg) from SpringVapor when I purchased my Boge Lea. After trying a couple of different tobacco flavored refills and disposables that were horrible, I wasn't even going to give another "tobacco" flavor a try. But after sitting down and talking to Nik for a while about his juices, I decided to give it a shot...it didn't help that he was vaping it the whole time and smelled great. I am SO glad that I decided to try it!! It is a very smooth blend with great caramel and vanilla flavors. The tobacco flavor is not very strong, but it is strong enough that you can taste it. After going through the sample bottle fairly quickly, I picked up a bigger bottle of 50/50 36mg. I have to say that I like the higher VG blend better...it is a little sweeter and the flavors are more pronounced, but the 50/50 is great also. This has become my daily vape, and I highly recommend it!!