The main ingredient of marijuana,tetrahydrocannabinol, can cross the placenta and thus may affect the fetus. If marijuana is used heavily during pregnancy, newborns may have behavioral problems.
rugs taken by a pregnant woman reach the fetus primarily by crossing the placenta, the same route taken by oxygen and nutrients, which are needed for the fetus's growth and development. Drugs that a pregnant woman takes during pregnancy can affect the fetus in several ways:
* They can act directly on the fetus, causing damage, abnormal development (leading to birth defects), or death.
* They can alter the function of the placenta, usually by constricting blood vessels and reducing the supply of oxygen and nutrients to the fetus from the mother and thus sometimes resulting in a baby that is underweight and underdeveloped.
* They can cause the muscles of the uterus to contract forcefully, indirectly injuring the fetus by reducing its blood supply or triggering preterm labor and delivery.
How a drug affects a fetus depends on the fetus's stage of development and the strength and dose of the drug. Certain drugs taken early in pregnancy (before the 20th day after fertilization) may act in an all-or-nothing fashion, killing the fetus or not affecting it at all. During this early stage, the fetus is highly resistant to birth defects. However, the fetus is particularly vulnerable to birth defects between the 3rd and the 8th week after fertilization, when its organs are developing. Drugs reaching the fetus during this stage may cause a miscarriage, an obvious birth defect, or a permanent but subtle defect that is noticed later in life. Drugs taken after organ development is complete are unlikely to cause obvious birth defects, but they may alter the growth and function of normally formed organs and tissues.
When you ask the question “How long does marijuana stay in your system?” you need to take into account the fact that there is no simple answer to this question. THC (Tetrahydrocannabinol) can stay in a person's body for as long as 3 to 90 days after smoking or being ingested orally. There are numerous determining factors for how long drug toxins stay in a persons body which vary from person to person, such as the analytical method used, your health, your body weight, metabolism, fluid intake, the type of drug toxin, and the degree of exposure to the drug toxin.
The speed at which marijuana leaves your body depends both on the speed of your metabolism, as well as on the half life of THC. 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.
For this reason, when you ask “How long does marijuana stay in your system?” you have to realize that it’s very unlikely that you’ll be able to get a usable answer. The most common period of time is anywhere from 3-30 days, depending on your metabolism and the amount of marijuana that you’ve smoked. This applies to the fetus as well.