There is a devastatingly sad subgenre of stoner romance where couples look back at photos and realize they remember none of the trips they took. The weed that was supposed to make the concert "amazing" actually erased the setlist. The romantic storyline becomes one of ghosts—chasing a feeling that is chemically impossible to recall.

The Plot: A DEA agent falls for a small-time craft grower in a state where legality is gray. (Think Weeds meets The Notebook).

If you are always taking a hit before a difficult conversation, you are never actually having the conversation. Many couples realize too late that their "mellow romance" was actually an emotional desert. They stopped fighting, yes, but they also stopped feeling passion. A relationship needs a little friction to grow; constant sedation leads to stagnation.