Can THC be transferred by kissing?

Answer 1

No. When you smoke or ingest Marijuana, most (if not all) of the THC is absorbed into the body. If it does get transferred, the amount will be so minute that it won't matter.

Answer 2

It is theoretically possible for THC to be transferred by kissing if one person has THC residue on their lips and transfers it to the other person. However, the amount of THC transferred this way would likely be minimal and unlikely to cause any psychoactive effects.