One of the main reasons why so many people find the 1:1 CBD THC vape pen ratio so appealing is because CBD may “tame” or “dampen” THC’s psychoactivity and side-effects to some extent, such as dry eye or anxiousness. This is why 1:1 cbd thc vape oil is often referred to as the golden ratio. While it’s up for debate whether this is THE best THC CBD ratio, the reviews are in, and the balanced effects of 1:1 cbd thc pens are getting five stars.