I do not agree with this method. They need lots of nutrient for big frosty flowers.
Do not starve a plant when they most need it.
Look at pics below.... still green fan leaves.
I go through quite a few vapes and would never blaze good weed.
A good few friends are now fully converted.
Best vape for a smoker is the VapCap as it is somewhat similar ritual as smoking.
I never mixed tobacco with weed.