This usually
depends on the state of your oil. If, for any reason, your oil is thick or
appears to be crystalline and solid, then we recommend turning on the preheat
mode.  In the opposite case, you can
ignore this step.
The general vape
pen preheating setting is 15s. You can heat it for 15 seconds first, drop the
oil and wait for a few seconds because the heat will gradually increase the
temperature of the concentrated liquid.