People under influence do indeed pose danger to other people. Even the influence of alcohol is potentially dangerous in certain situations leading to incidents ranging from hit and run to domestic violence.
I know that caffeine was a bit of competition for alcohol in the period right after it was introduced (some think that enlightenment was caused by this), but I don't think it's like that anymore.
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.
https://www.ama.org/publications/MarketingNews/Pages/feeding...
here's some BS from the AMA, though.
(I have never used drugs, other then alcohol.)