Yep and yep.
They also have a way of changing you're perception of life. Most people tend to be more.....well....happy! A silent few get heavily depressed.
More generous than normal, talkative, expressive, socialable, etc. It can also keep you up for a couple days. I've had a few minutes of narcotics training and spent six hard years in the underbelly of the city. Ah the good ole days
