I can go almost indefinitely without cocaine. I can go for little more than 24 hours without coffee.
I can get up in the morning and consider leaving the house for work without first doing a blast of cocaine. I can’t bear the thought without a blast of espresso.
I can concentrate on my work without my brain interrupting me to demand a line. I can hit a wall, fall on my ass and stay there for want of coffee.
If I wake up in a motel or someplace where there is no coffee I will go out and get some without even brushing my teeth, and persist in my quest for coffee until I score. Even on a bad day you won’t see me out there copping a bag.
Therefore, coffee is more addictive than cocaine. QED.