How long does marijuana stay in the blood stream?

One Month. For a heavy user up to one month, rarely longer. Thc really doesn't stay in the blood stream, rather-it is stored in fat and is considered fat soluble. In fact, that is why it can take so long to get out of the body. The thc has to get out of the fat cells. It does depend upon, as one colleague has noted, the frequency of the use as well as the potency of the drug.
Weeks. The effects of smoking marijuana fade quickly, but the drug, known affectionately as "weed, " can be detected in the body for weeks and sometimes longer. How long it remains in the system depends on how often or how much marijuana the user has been smoking.

Related Questions

How long does marijuana stay in your blood stream?

A few hours. It is broken down into other products within a few hours. These can be stored in fat and then released into the body and urine for weeks or longer depending on how much and how often you use. Read more...

Docs, usually how long is marijuana in your blood stream?

THC. Single use marijuana can be detected 12 to 24 hours in blood. Regular use marijuana can be detected for 2 to 7 days in blood. Read more...
Depends on usage. it can be as long as 6 weeks in heavy users. Picked up in urine tests. On the other hand, it can be gone in a few days in second-hand smoke exposure or a single inhalation. It varies from person to person but not as much as the amount used and especially usage on a routine basis. That causes a lot of build up and longer clearance times. Read more...

I have an immunization blood test tomorrow and I smoked on Friday. Will they be able to trace thr marijuana in my blood stream for this test?

Unlikely to look. These tests are rather specific and will generally only look for what they have an interest in.If this were a pre-employment physical or drug monitoring program they might look, but in most locals you must sign a specific waver to be tested for any drug. Read more...