How can some people smoke weed so often? What are they doing?

I've gotten high maybe 3 times in my life. Not because I have anything against it, just not something that is really ever available. When I was younger it was just a way to relax and that's it, but the most recent time I got high I had some other drugs in my system and it was a whole different kind of high. Very intense and very enjoyable. I'm not saying I wanna smoke everyday but I'm curious as to what people do all day when they are smoked out 24/7. Is it all just about the high?