Yes, juice will affect things....both TH and vapor. The juice or the filled carts that come with these things is usually not great. If you order some great juice from an American vendor....you should see a difference. You know, you have to start somewhere. Don't be remorseful about your purchase.....learn on it....learn how to do stuff, learn what you like about it (size, looks, vapor, TH) and what you don't. Then when you're ready to upgrade, you can get a 510 or an eGo or something, and pass this one along to someone else as his/her "first" PV. I started with a little RN4081 and it served me well. What i didn't like was that it only held about 4 drops of liquid at a time. After a few weeks, I passed it along to my sister and I ordered a 510. There really is a difference, but without my RN4081, I'm not sure I would have appreciated the 510 as much as I did. LOL. After that I pretty much had the hang of everything and knew I liked the 510....the only problem was I was constantly charging batteries, so I got the eGo. That's my story. I don't regret the RN4081...and it worked for my sister, too. We all have to start somewhere. You may learn to love that little thing....esp. if it's responsible for getting you off analogs. Get you some good juice with a mixture of PG for the throat hit and VG for the vapor.....and enjoy. When you're ready to move on, a 510 kit is only about $35 or so....and an eGo/Riva in the $50 range.....save up, shop around, and get your second PV. Before it's over, believe me, you'll have more than one anyway.....and more than two.....and probably more than three.....four.....
I see you have cartomizers....they hold more. Get some juice and you'll see a big difference.