You'll be too busy hunting for snacks to eat. And getting fat.
I smoked pot when I was a teen. One time my girlfriend's parents were out of town, and she decided we should make some brownies with pot. Filled the kitchen with smoke. Guess what? Her parents came home early and we frantically tried to open all the windows and get rid of the smell. Never did that again. My next girlfriend wouldn't smoke, and got me to give up pot. Never used it again, and married the gal. My friends who stuck to getting high never amounted to much in their lives.
Like with many things, it all depends on the person. The "lazy stoner on a couch" trope has been disproven by many individuals. Is there truth to it? Sure. Some of us, however, don't spend our every waking hour with it. Some of us are actually good, productive members of society without any psycho breaks from reality and always vote Conservative regardless of 25+ years of regular use. The "Reefer Madness" garbage never ceases to amaze me and make me chuckle, even sober.