definitionally you aren’t vegan if environmental impact is your terminal goal. It would be like saying you’re Christian for the cathedrals or something.
Veganism is a philosophy and life practice of trying to minimise harm to other earthlings. It can involve environmentalism as an instrumental goal, that is protecting the environment to avoid mass suffering, but a world of perfect environmental preservation where all ants have depression would be unacceptable to a vegan but not to an environmentalist.
Many people with environmental goals adopt a plant based diet and/or lifestyle.
Smoking: easy way to quit smoking plus weed during the worst withdrawal to avoid snapping at everyone
Weed (earlier lmao, I still use sometimes but less than a gram a year really): having other things to do that require concentration and memory I enjoy. Weed is easy as it’s mostly habitual. The sleeplessness is the worst and it’s only a couple of days
Opiates: Exercise, avoiding boredom (v hard! video games, gardening, easy books, podcasts etc), lots of walking those restless nights, preparing easy food for the worst few days, counting days to know it was going to end. Be careful after surgery kids that shit sucks to come off.