1. How do you define psychoactive and addictive drugs?   

2.Why are they defined as the most addictive? 

Is there any one or more of them that the US Government does not seek to limit its use? 

Follow the links below and list five drugs that the US Government identifies as the most addictive drugs.

 https://www.drugabuse.gov/drugs-abuse/commonly-abused-drugs-charts