The downside: smoking. Switch to nicotine lozenges. Smoking is horrible for bipolar disorder and depression.
Can you elaborate a bit Vic-Luc?
I've been debating whether to try and explaining it simply or going the science route and this is where I'm stuck. Everything I've learned shows that not only does smoking predispose one to future mental illness, it doesn't do anything but exacerbate those that suffer from existing mental illness.
As of 1994, research suggested not discouraging people from smoking if they were depressed. 13 years of neuroscience research later, the opposite is true.
I'll try and find a balance when explaining this. You switch to lozenges with the eventual goal of quitting.