How long before/after breast augmentation should I stop drinking alchol?

Mild to mod alcohol? At 18, I hope you are not consuming excessive alcohol which is considered more than 2 drinks per day. Patients who consume this much are at a higher risk of numerous complications. If drinking small amounts, refrain from alcohol for 48 hours and certainly no binge drinking prior to that.
Depends. Alcohol not as much impact as smoking. Don't smoke! Stop couple days before and don't drink after as long as you are on pain meds. Never mix alcohol and narcotics! Ask your surgeon his/her opinion - follow that advice. Good luck and be well. .