Nicotine and caffeine are drugs but when did you last hear of people crashing cars or killing other people because they were high on nicotine or caffeine. I'm sure it's an ancillary factor and if you could investigate with strict accuracy you'd find they had a non-zero influence. But putting them on the same semantic plane as you are doing implies that people in the grip of a nicotine or caffeine buzz are little different from people who are drunk, and anyone with real-world experience knows that's nonsense. You're not helping your point by reflexively making nitpicking arguments.

I'm pro legalization for all drugs, but but I'm not going to dispute the fact that booze, cocaine, and heroin are just like cannabis, caffeine and nicotine because it just isn't true. If you don't acknowledge the reality of people's experience when making your semantic arguments then people are going to ignore you.