Why are many people in love with marijuana and use it daily?

One of my grandsons who had a rough life appears to be obsessed with weed. He could even be selling it. Last time he visited us he sat in the hot tub and could talk of nothing else. On his Facebook page you click on his links and guys are rapping or whatever it’s called to drums and using the “F” word and “smoke” in every sentence and I think they’re professionals. He wants “Fly High” on his baseball cap for some reason. It seems to be his comfort zone to say the least. I know millions of guys like having some beers after work, on the weekends, at parties but that doesn’t seem obsessive to me. And where are the rap artists thumping to Budweiser? He is “staying with” some older guy in his twenties who just got out of jail for possession with intent to distribute and carrying a gun. What is this worship of weed all about with little thought of being shot? For me , I like to have my head on straight, know what time it is and not feel spaced out but I do not care how others feel about it. One Margarita is plenty for me and I feel in control with it.