This is only true on the AT if you never camp near the rat-box shelters and spend minimal time at the shelters.
You definition of Fun is different than my definition of fun. Of course I dumped demon booze and pot way back in February 1973 and see the use thereof as a temporary inertial-station on the ladder of life. No movement forwards, probably going backwards etc etc.
So when I'm backpacking the AT and come across dope smokers or drunks (esp at shelters) I reflect on my personal life-and-death struggle with drugs (alcohol is a drug) and know eventually these boys will have to quit when they hit bottom. Just not there yet.
I have an especial low regard for so-called "nature lovers" who worship in the church of the outdoors and yet bring booze (or pot) on backpacking trips and into camps and then suckle for hours on the Demon Teat. I question their intent. It's all about intent.