Honestly, I think it depends on the person.
If you thinks it's a sin, then refrain from it. But don't condemn others that do. Nothing more annoying or even encouraging than eating a Chicago Style pizza (ham, mushroom, bacon, pepperoni, Italian sausage, meatball, and seasoned beef), and having a nutjob break in that just by eating a slice I will find myself in the bowles of hell, after suffering a horrific heart attack that causes my internal organs to explode. Honestly, it makes me want to eat more deliberately, letting the cheese stretch with every forkfull, and show a little "see food" to him gross him out enough to leave me alone (I never said I was a saint. Trying to get there, but SLOWLY!
Same goes with smoking and drinking. I was raised in a home that taught me "Drink is urine for the last leper in hell!" I don't drink to excess by any means, but I do enjoy the occasional Heffeweiser or tipple of Port now and again.
Now there is going overboard. If you get drunk every few nights and have a blood achohol level of kerosine, or smoke enough cigs to make Oppenheimer wretch and you receive frequent visits from the fire department on long weekends just from what you call the norm, or even eat enough pizza in a week to make Friday night delivery routes avoid your house for fear of running out of food, then you sir have a problem and need to seek counseling. That is abuse, and needs to be dealt with.
God's grace be upon everyone with a problem and may He help them to stop before it ruins them.
And keep away from my pie! Friggin grass eaters!