I'm a new member to ECF and new to using a personal vaporizing device, not totally off analogs - down to or 4 a day from 1.5 packs a day for the last 35 years. I purchased a very nice Riva starter kit from EVCigarettes along with two 10ml bottles of juice that were18mg each nicotine. I think this will work for me. I even tried some 5 ml samples but, need a good throat/chest hit still. My question is about my pulse and heart rate. After a week and a day I have noticed that when I vape a 510 carto of juice (4-7 drops) I get an fast heart rate for about 15 minutes afterward. Is this normal? Am I consuming too much per session? Should I use a lower nic content juice? Any advice would be appreciated because I gotta get off analogs!!! Thanks in advance!