I don't really know how anyone could honestly compare caffeine and amphetamines. One is like a knife and the other is like a 50 cal machine gun, as far as stimulation goes. There is a reason amphetamines are a schedule II drug and caffeine is not.
How do alcohol and cigarettes not fit this definition!? Meanwhile, edible cannabis is relatively safe and Ecstacy has shown promise as a component of PTSD treatment. Just a few examples...
"Well, marijuana is a schedule 1, so we can't test it for legitimate applications. And since it's schedule 1, it has no medical applications".
There is absolutely no scientific or chemical basis of "schedule". It was originally a way for Republicans (Nixon, Reagan, etc) to use the law to arrest hippies and black people. And we have no further to look at crack/powder cocaine and sentencing disparities. Crack was inner city and primarily used by black people. Whereas powder cocaine was used more by whites outside of the inner city core.
They are both stimulants. I've done both, like I said. So yes, for my body (n=1) I can indeed compare them. And it was sincere and honest.
And the only reason why caffeine isn't schedule 2 is the same reason why alcohol and nicotine isn't either. That's purely a societal reason, and no basis in chemistry. If caffeine/coffee was discovered last year, it would be schedule drug. Look no further than kratom.
It also has some nasty side effects that come with abuse. Mental problems being the first ones, depression, anxiety, mood swings ...