Vaporized CBD (isolated by itself) is apparently quite effective for many people who have trouble getting to sleep because they can't stop worrying about every possible outcome of an upcoming meeting or date, or replaying stressful conversations or situations that happened days, weeks, or even 5 years ago.

The "broad spectrum" products that have multiple active components are far more variable, clearly.

Sure, if you smoke sativa. Indica does wonders for anxiety, but until recently most people were stuck just smoking whatever they could get their hands on, even if it resulted in a bad high.