Breastfeeding is brill and I want to carry on for a couple of months or so - but I still like the odd glass of red with a hearty meal and a good natter over a cappuccino. I liked this website that tells you the facts on social drugs and their effect on breast milk.
CAFFEINE : "Unlike alcohol and nicotine, the effects of caffeine on breast milk are at their highest after 1 hour of drinking the tea, eating the chocolate, and so on. So you may be able to time your caffeine hits so that you have them just before a breastfeed. And it can help to drink lots of water so that you stay hydrated and the effects are diluted."
Great! I now make sure that I have my coffees just before or during feeding
ALCOHOL : "The general rule of thumb is 2 hours for every standard drink [for the alcohol to wear off], but again that will depend on your weight, if you have been drinking on a full or empty stomach, and if you have had any water in between drinks."
The site also lists the facts for Nicotine, Marijuana, Methamphetamine, Heroin and Methadone!