The length of time it takes for CBD to take effect will depend on the route of administration. The fastest effect will be felt from smoking or vaporization (onset of effects in minutes). Topical administration of CBD will be felt quickly as well. The next fastest effect will be felt from a sublingual dosage (onset of effects in 15 – 60 minutes). The slowest effect (but the longest lasting) will be felt from oral ingestion (onset felt in 90 minutes). Source: Cannabis Revealed
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