It's definitely true for me, started as a kid. As I grow out of one habit or truly accepted how it negatively affects me I move on to another thing. It's been Religion>Food>Exercise>Alcohol>Food>Caffeine>Weed>Exercise>Weed>Psychedelics>Weed>Food over the last 25 years or so. I feel very fortunate I never picked up opiates or benzos, cause the couple of times I had them... Oh boy. Life as a hippy with perma-munchies isn't so bad in comparison.