Cigarettes and alcohol

So I’ve been drinking for about 6-7 years, been smoking cigs way longer than that. It seems like once I get to a certain point, I just start heavy chain-smoking I mean really smoking em down. I go through roughly half a pack a day, but give me a couple drinks and a new pack and I’ll smoke it in one night. (I smoke menthol golds) anyone else have this happen? Or have an explanation?