It is possible to smoke coffee grinds like you would tobacco by rolling the coffee grinds up in cigarette paper or putting the coffee grinds in a tobacco pipe and then lighting the coffee grinds and smoking it.
My Grandpa used to smoke coffee in his tobacco pipe when he ran out of tobacco.
Although it's not the same as the nicotine you would get from tobacco it can still be a pretty good smoke as I've tried it myself before when I used to smoke.
Coffee however does not contain any nicotine but instead caffeine.
It is possible to overdose on coffee beans as you can get an overdose of the Caffeine which is a drug that can be very addictive.
In moderation coffee beans are healthy to eat but too much can lead to heart conditions, possible heart attack, stroke etc.
Coffee beans are okay to eat but just don't eat too many of them.
The coffee beans can give you energy and are healthy for you in moderation but eating too many coffee beans could overdose you on caffeine.
Coffee beans are edible and are safe to eat.
You can either cook the coffee beans and eat them or you could eat the coffee beans raw.
Eating the coffee beans raw may be hard to do so you might want to cook the coffee beans to make them easier to chew, digest etc.
Just don't eat too many coffee beans because when coffee beans are eaten in excess it can cause health issues because your caffeine intake would be too much.
Too much caffeine can be bad for you but in moderation it's okay.
The coffee beans are loaded with antioxidants as well so they can help keep you healthy as well as boost your energy.