James Franco: Why I Don't Smoke Pot

@DanaRoseFalcone

12/15/2014 AT 07:10 PM EST

Despite a convincing performance in Pineapple Express, James Franco doesn't actually smoke pot.

In an interview with Howard Stern on his SiriusXM radio show Monday, Seth Rogen, 32, revealed that his The Interview costar 'doesn't smoke weed at all.'

'I just haven't done it in a long time,' Franco, who joined Rogen on the radio show, told Stern. 'There's just no need.'

If he were to actually indulge, Franco, 36, says he likely 'couldn't function' while working and admits that the scenes in which his character was high in Pineapple Express were merely acting.

Working alongside pal and frequent smoker Rogen, allows the former Oscars host to 'get high by proxy,' though.

Recently, Rogen smoked before doing a scene in Franco's Zeroville, a small movie about filmmaking in the 1970s.

How'd he do?

'Seth was great in that scene,' selfie-obsessed Franco raves.

The recent Saturday Night Live host reveals that it's often hard to tell when Rogen is high while filming, adding that marijuana's distinct aroma is never obvious on set.

Rogen agreed, saying that while he likes to indulge when shooting and directing, he keeps his pot use from disrupting his workday and believes smoking isn't essential to his creative process.

'Being on set high is something you have to get used to, especially when you're one of the people in charge,' the Canadian actor says.

Although he prefers to pass on weed, Franco doesn't judge Rogen's hobby.

'I don't think it's any different than somebody having a glass of wine or something at lunch for Seth,' Franco says. 'But other people can't handle it.'

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