Hi, I recently made the switch to e-cigs, haven't had an analog for 78 hrs. I am 24 years old and smoked a pack of analogs (Marlboro reds) almost every day since I was 15. I am using the Riva 510 and e-liquid with 24 mg of nicotine. Although every now and then I get the urge to smoke an analog (especially after I eat), vaping has worked pretty well. The only thing that worries me a bit is that I am feeling very tired all the time, definitively more than usual. Don't know if this is normal from quitting analogs or maybe I'm vaping too much?