Smoking can cause significant health problems, from heart disease to asthma to lung cancer. If you are having surgery, it's critical to quit smoking all substances including marijuana. Smoking and/or inhaling any substance into your lungs can increase the risk of anesthesia-related complications like infections, pneumonia, and heart attack. That’s why it’s important to quit smoking at least 2 weeks before surgery and a minimum of 3 months after surgery. With that said, please do not be afraid to tell your anesthesia provider if you have been smoking or using other substances before surgery. The information will remain confidential and will benefit you in the care you’ll receive.