Ok this is less of a tip and more of a cop-out but nicotine has been shown to release acetylcholine and dopamine in such a way that schizophrenics greatly benefit from using it as a cognitive aid. 

However with smoking tobacco you actually can cause more harm than good with the instantaneous release of dopamine in a immediate and intense fashion. And then you have to deal with withdrawals and the addiction in general. 

However, I’ve found that by using Zyn pouches (in combination with healthy eating and exercise (i will really abuse the nicotine if I don’t)) I can get a slow drip of nicotine so that I have a temporary stream of focus.

When they’ve been used too long you get physically sick so you get an idea for when to take a break. The withdrawals are a little sucky (digestion problems, irritation and this really weird dusty feeling) but the number of times I’ve just been dissociating with negative symptoms and I decide to use a zyn and immediately I can think and atleast plan to do something even if I don’t want to do it is pretty high.

Zyn is a nicotine pouch so it’s tobacco free and doesn’t cause cancer. 
Now it is nicotine and it is addictive, therefore it’s not preferable, but if you find that negative symptoms are just draining everything out of you, this provides a little buffer to that.

It makes me feel a bit uneasy or “grey” but it makes me be able to focus more closely to how I was like pre-psychosis, and not just in that I have more concentration or attention, but in that I was able to think in a way that was more constructed and secure. 

Anyways I thought this information might be useful.