Researchers have found that nicotine in cigarettes cancels out the sleepiness caused by alcohol, basically allowing people to keep drinking … and smoking. The two vices feed off of each other.

It takes time for your brain to stop associating the two activities. So when you decide to quit smoking, it will help to take a break from drinking, too, at least during the first few weeks. If not, your brain will send out a signal prompting you to reach for a cigarette every time you have a drink. Try chewing gum or having a sugar-free candy instead.