Exercise and healthy diets do not have the same effect on your mind as weed. I say this as a person who has a fairly healthy diet and exercises everyday.

Marijuana alters your state of consciousness. It enhances certain senses (taste being famous) but also allows for socializing and empathy. As a person who’s extremely narcissistic, it has helped me gain a lot of empathy by allowing me to “step aside” and observe my actions and those of others around me. And if you’re high with your partner, you can have a very fulfilling bonding experience (emotionally as well as sexually).

The only thing I’ve experienced come close is meditation. But that takes a lot of time and effort.