The brooding Wanderlust actor spilled the beans on his lifestyle by revealing his dopey pastime.
‘I’m into discovering stuff about myself – or smoking more pot,’ said the 40-year-old, who plays a hippy alongside Aniston in the new flick.
He also explained that lighting up brings on his dark side.
‘I cry when I smoke pot,’ Theroux added. ‘It takes me to all the s*** that happened in my childhood.’
It’s not the first time Aniston, 43, has attracted a potty man in her life.
In an interview earlier this year, her ex-hubby Brad Pitt recalled how his former marijuana habit almost turned him into ‘a doughnut’.
The 48-year-old said: ‘I was hiding out from the celebrity thing, smoking way too much dope, sitting on the couch and turning into a doughnut. I really got irritated with myself.’
But Theroux has insisted he’s not a free spirit when it comes to high times – especially when it comes to sharing his famous girlfriend.
‘I’m not into free love,’ he told OK! magazine. ‘I just find that lifestyle very unappealing.
‘I think all of us in our lives look for a little oasis but I am not going to make my day about it.’
Theroux recently showed off his fun side on The Ellen DeGeneres Show when he said he breakdances at night to impress Aniston.