Second thought: What’s implied is that either humans are less resistant to addiction than rats, or there’s something about civilization in general which makes people less resistant to addiction.
There are more addictive things for humans produced, and it is easier for humans to get them.
Human mind can create the “small cage” effect even without physical constraints. Sometimes people feel ‘trapped’ metaphorically.
Second thought: What’s implied is that either humans are less resistant to addiction than rats, or there’s something about civilization in general which makes people less resistant to addiction.
There are more addictive things for humans produced, and it is easier for humans to get them.
Human mind can create the “small cage” effect even without physical constraints. Sometimes people feel ‘trapped’ metaphorically.