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This is what I found for drugs staying in your system:

Alcohol - 3-5 days in urine (eTg), up to 90 in hair and around 10 - 12 hours in blood.

Amphetamines - 1 to 3 days in urine, up to 90 in hair and around 12 hours in blood.

MDMA (Ecstasy) 3-4 days in urine, up to 90 in hair and 1 - 2 days in blood.

Barbiturates - 2 to 4 days in urine, up to 90 in hair and 1 to 2 days in blood.

Phenobarbital - 2 to 3 weeks in urine, up to 90 in hair and up to a week in blood.

Benzodiazapines - 3 to 6 weeks in urine, up to 90 in hair and 2 - 3 days in blood.

Marijuana - 7 to 30 days in urine, up to 90 days in hair, two weeks in blood.
Methamphetamine (crystal) - 3 to 6 days in urine, up 90 in hair, 24 - 72 hours in blood.

Cocaine - 3 to 4 days in urine, up to 90 days in hair, 1 - 2 days in blood.

Codeine - 1 day in urine, up to 90 days in hair, 12 hours in blood.

Fentanyl - 1 day in urine, up to 90 days in hair, 4 hours in blood.

Morphine - 2 -3 days in urine, up to 90 in hair, 6 - 8 hours in blood.

Heroin - 3 to 4 days in urine, up to 90 in hair, up to 12 hours in blood.

LSD - 1 to 3 days in urine, up to 3 days in hair, 2 - 3 hours in blood.
Methadone - 3 - 4 days in urine, up to 90 in hair, 24 - 36 hours in blood.

PCP - up to 30 days in urine, up to 90 days in hair, 2 - 4 days in blood.

Dilaudid - 2 to 3 days in urine, up to 90 days in hair, up to 22 hours in blood.

Suboxone - 2 - 5 days in urine, up to 90 days in hair, up to 3 days in blood.

Read more: How long do drugs stay in your system

However there also was the answer that if using marijuana every day for an extended period then suddenly stop, yes the drug will stay in your system for about 30-40 days. The other drugs will be in your system longer as well. presumably because you have built it up in your system.