Usually 5 to 10 minutes.
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The effects of smoking weed typically begin within a few minutes and peak around 10-30 minutes after consumption. The duration of the high can vary depending on factors such as dosage, tolerance, and individual metabolism, but it usually lasts 1-4 hours.
It is unlikely to get a contact high from sitting in a room with weed smoke unless the room is poorly ventilated and you are exposed for an extended period of time with a high concentration of smoke.
If by "dirty" you mean high, it's possible. If you just smell the smoke but it isn't close to you then nothing will happen. If you're close to it and the smoke is in you're face then you might get a second hand or "contact high"
Taking a shower may help reduce the smell of weed on your body, but it typically doesn't significantly impact your level of intoxication. The effects of being high will gradually lessen over time as the marijuana is metabolized by your body.
It can take up to 7 days for THC to be cleared from saliva after smoking weed, but this can vary depending on individual factors such as metabolism and frequency of use.
Smoke detectors are designed to detect the presence of smoke particles in the air, regardless of what is causing the smoke. This means that smoke detectors may detect weed smoke, as it is still smoke in the air. However, the sensitivity of the detector and the specific composition of the weed smoke may affect how quickly and reliably it is detected.