Smoking is a single habit that a large percentage of people have no problem never being tempted to do.

Unsustainable practices pervade societ in a way that requires real education and lifestyle changes to avoid. It's not enough to "just stop polluting," you first need to learn how to. The fact that beef is unsustainable, that other meats are still far less sustainable than a plant-based diet, that some plant-based foods are still unsustainable. Where to get the sustainable plant-based food without them being packaged in disposable plastic -- and at prices you can afford, at the job you work at where commuting doesn't require a private vehicle. Learning that basically everything sold online from overseas is unsustainable, especially most of the stuff that advertises itself as sustainable. Learning to be content with what you have, unless it's a gas-powered dryer because wouldn't a heat pump clothes dryer be better? But really you should air dry your clothes!

Unsustainability isn't a single habit like smoking, it's entire lifestyle and thought patterns and ignorance and you have to learn about it all and change deeply ingrained habits. That's why blaming the individual is so unproductive. Governments should have responded to the danger of climate change a long time ago but chose not to, even actively accelerating it for profit. The failure lies there.