First, try to cut back on the smoking. Just cut back on a cigarette a day until you are down to a cigarette or two a day. It may take time but you are slowly easing off instead of a quick stop which will be hard for your body.
Second, eat some type of carb, protein and fat meal for breakfast like eggs and grits/bread or some type of nut butter and bread like peanut butter or just eat the nuts/seeds by themselves. Hemp seeds are a good start if you are allergic to nuts. Also, try to do more exercise but since you are low in dopamine, try to get your cardio up as dopamine is involved with walking/running so cardio will help get your levels up, but make sure you keep eating those fatty foods, and protein after you workout as it will help build up your dopamine.
Lastly, get your sleep in the dark, and try to be relaxed as much as you can as sleep is when your body regenerates which means the next day, if you did everything I stated, you will have more dopamine and feel better.
All this just so you can pretend to be a character in the film limitless.
naw I'm good breh I ain't trying to die 
