[sph]

I mentioned nicotine because in my experience nicotine is much better at releasing dopamine than caffeine does, thus improves focus more than the other. Coffee raises other neurotrasmitters with a little effect on dopamine.

That said, coffee and nicotine are two stimulants that go and feel great together.

Before I was diagnosed with ADHD, I used to chain vape whenever I was coding or before bed to calm down. It had a similar effect amphetamine has on me: holds my focus and calms my mind down, but with noticeable side effects such as high blood pressure, pulse rate and a house that smells of smoke or papaya blast.