If anything, I’d wager that a lack of impulse control in some folks leads them to eat junk food and consume THC. Correlation, not causation.

There are a number of impulse control disorders that I feel are all related, in the sense that if you’ve got a lack of impulse control you’re more likely to overeat, consume drugs and alcohol, get addicted to video games, gamble, have risky sex, etc. I have gone down a few of these paths personally due to to my own problems with impulse control and have seen similar patterns in others.