“One of the most commonly cited reasons for chronic cannabis use is to cope with stress.
Consistent with this, cannabis users have shown reduced emotional arousal and dampened stress reactivity in response to negative imagery.
Chronic cannabis use is associated with blunted stress reactivity.” https://link.springer.com/article/10.1007/s00213-017-4648-z?no-access=true
“WSU study: Regular marijuana users more calm under stress” http://komonews.com/news/local/wsu-study-regular-marijuana-users-more-calm-under-stress
“Potheads don’t stress easily, say WSU researchers” http://www.spokesman.com/stories/2017/jul/31/potheads-dont-stress-easily-say-wsu-researchers/