Power of Statistical Evidence

During in-class activity I listened to one of my classmates, Chris's short 5 minute oral presentation on drug use. His said that drug isn't the problem--it's the environment that is making people addicted to drugs. His first argument was an experimental one, where rats got addicted to heroin less frequently when they were put in a better environment (more food, mating partners, not caged, wheels provided) than the ones that were caged in solitary confinement, even if the two groups were provided with same amount of heroin. His second evidence was a statistical one--during Vietnam war, (if I recall correctly) 1 in 5 American soldiers were addicted to heroin. When the soldiers came back to home, 95% of them were able to recover from drug addiction. In just short 5 minutes, Chris was able to convince me that as he claimed, that environment people are put to are more integral to understanding drug addiction. This exercise taught me how powerful an appropriate statistical evidence can make an argument buyable, even if there is no fancy graph or any visual aid.