I think my coil might be done. My ejuice is turning very dark in the tank and tastes like burnt marshmallows! The only coils I have are 1.8 ohm, the one I have in the tank now that I think might be done is a 2.2. My question is can I use a 1.8 ohm coil with a 3.7V battery? Very new to this and when I bought new coils I had no clue what resistance to get. 