…would it be healthier to do it before or after working out? It’s for a bet.
Neither.
How much did you lose?
Just one? No difference.
My WAG would be before. My WAG reasoning for this would be that afterwords your body is depleted of oxygen and trying to bring more in via your lungs. If you fill your lungs with cigarette smoke, it’s going to be drawing that in.
But that’s an uneducated guess.
After.
Define “healthier”.
Nicotine is a vasoconstrictor, so smoking a cigarette raises your blood pressure (as much as 10mmHg in some people). If you smoke and then work out, your risk of angina or an MI or stroke might be slightly elevated as a result of this temporary rise in blood pressure. I don’t know that it would be a statistically significant amount, though.
That’s what I bet. My reasoning is that since you breathe heavily when you workout, you expel the smoke and the carcinogens along with it.
My coworker waits until after his workout because he thinks breathing heavily sucks in the bad stuff deeper.
I don’t smoke, btw.
We already agree on that.
I do after. I find that I can’t do cardio as efficiently directly after a cigarette, and I get winded more easily with weights as well.
Coming home, a nice protein shake and a cigarette are a nice cooldown 
Yeah, you might inhale more deeply afterwards, increasing the actual amount of smoke you take in. Otherwise, pound for pound of CO, nicotine, tar, soot, and whatever else is in there, it probably makes no difference.