Always start low (around 10W or 14W), vape a few times. If that doesn't give you a satisfactory flavor and/or vapor, turn it up a few and vape again. Keep doing this until you get a harsh vape or it tastes slightly burnt. Turn it down a little and that should be the sweet spot for that coil and juice. There is no "best temp" for everyone, it's whatever is "best" for you. Vaping is very subjective and very personal. What works for someone else may not work for you. We call it "vaping" and not "smoke," if something is "smoking," that means your temperature is set too high and something is burning.