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If you intend on breastfeeding you should not smoke, for that time being, but typically marijuana leaves the system within 30 days. Sadly, I have yet to read any studies on marijuana in breast milk. The THC will not be gone from your body in 30 days. Milk is high in fat to nourish the baby's developing brain. THC is fat soluble and "it's estimated that THC can have a half life that ranges anywhere from 1-10 days. It's almost impossible to find out what that half life is, which means that it is very difficult to use it to calculate how long it will take for all of the THC to leave your body. " The concept of "half-life" is that if the half-life is 10 days, half of the original load will be gone. Ten days later, half of that half will be gone, leaving you with a quarter of what you started with. After 30 days, you would have only gone through 3 half-lives so you would still have an eighth of what you had started with. If you are going to expose your baby to THC, you ought to let your pediatrician know so it will make it easier to diagnose the baby's developmental problems that will almost inevitably result from your selfish choice.

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2009-03-15 02:53:11
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Q: How long after you smoke marijuana can marijuana show up in your breastmilk?
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