This comment hit the nail on the head. It's no big deal to spend an evening after work getting high and watching movies. But then it becomes every evening. Now you can't deal with daily life if you don't get to smoke between work shifts. Maybe you show up to work high to take the edge off. Now you're high all the time and being sober feels weird. Spending all your time just sort of floating in a dream because being high is your default state now.

Everything becomes more effort so you just stop bothering. Playing an instrument? This requires too much focus. I'm gonna go lay down on the couch. Socializing? I'm too high to drive, I'll stay home today (man I'm so freaking lonely). It really truly is a trade-off where you sacrifice a fulfilling life for an easily tolerated one. At some point you start to realize this and increase your intake to try to make those uneasy thoughts go away.

Does this sound anecdotal? That's because it is.