Try e-cigarettes, etc. to replace the cigarettes. Exercise also gives a cognitive boost. Get an exercise bike (or real bike) and do 5-15 minutes of interval training on it. Cut down on the sugar - coffee instead of soda, nuts instead of candy bars or donuts, etc.
Exercise is quite useful, especially in eliminating white spaces in your routine; i.e. avoid walking and bike instead. It is almost impossible to hold a cigarette and so you won't think about it while biking. Also, smoking is not very effective after exercise, your white space is used for muscle healing and the addiction pangs are muted.
The rest of your advice is not as useful: they are simply other bad habits that you should probably quit anyways and not related to smoking. If you have limited willpower, focus on killing one bad habit at a time. There is a reason people often get fatter while quitting smoking; they try to fill the gap with other bad ones.
But to each their own. Not-ever-smokers obviously can't give good advice about stopping because they don't understand the habit anyways; while smokers and ex-smokers are a bit diverse in what works for them.
Former smoker here, the experience is totally satisfying. I smoked for a good ten years, and quit immediately the day I got my first e-cigarette. That was almost three years ago, and I haven't wanted to smoke real cigarettes for a second.
I do have friends who've gone back to regular cigarettes, but (based strictly on casual observation) it's about a 50% rate of recidivism. And I see more and more people using them lately. Three years ago nobody knew what the hell they were, and lately I run into a surprising number of people who not only know what they are, but are excited to talk about their new battery mod.
People are diverse I guess.