A: Delta8, delta9, and delta10 THC, among other variants, are each considered to induce intoxicating effects when consumed in high and sometimes low concentrations. 
This goes for some terpenes too. 
Full-Spectrum products do contain legal levels (of no more than 0.3%) delta9 THC and oftentimes terpenes, as well. 

This can lead to mild psychoactive effects, depending on the user and the circumstances of usage.