Just an anecdote, Markus Ruhl smokes cause he is so hungry all the time.
I smoke and although it helps greatly on a cut it only sometimes bothers me on a bulk. Just like you can ignore your appetite on a cut, its not hard to overcome nicotines appetite suppression, you need to just listen a little better for that hunger signal, or dont expect to be hungry until you see/smell the food.
I dont believe it directly interferes with training, my training partner doesnt smoke and he loses his breath a lot more than me, the body just conditions itself to smoking.
On a positive note nicotine is an aromatase inhibitor.