this can happen in Larry's car, in Freddy's apartment, they could be alone or with another character. Just delight this stoner anon with some weed porn (and if actual porn ensues, that's great, too)

I personally see Freddy eager to smoke with Larry, if only to keep in character and keep up the camaraderie. But since he's not used to it (first time, even?), it will hit him like a ton of bricks.