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A 22-year-old female asked about a male:

How many hours till marijuana and alcohol pass your system?

2 doctor answers3 doctors weighed in
Dr. Gerald Mandell
Nuclear Medicine 52 years experience
Varies: The effects of smoking marijuana fade quickly, but 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.An average person can eliminate 0.5 oz (15 ml) of alcohol per hour. So, it would take approximately one hour to eliminate the alcohol from a 12 oz can of beer.
Dr. James Ferguson
Pediatrics 46 years experience
Differs for each: The time it takes for 1/2 the alcohol to leave your system is about 4 hrs.If no more is ingested, 1/2 the remainder in another 4 and most is gone by 8-12h. Weed is a different issue.It attaches to fat cells in your body and can leak out over time.A light user with minimal intake could se it gone in less than a week.A heavy or long term user could have it stay at detectable levels for months.

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Last updated Feb 14, 2017

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