I could list positives and negatives. Different strains provide drastically different results so I would be very careful about what strain and how much. That's why it's helpful to see a medical marijuana doctor.
Also, that sorta sounds like peer pressure. Weed is a drug, I don't care what anyone says. (I've used it for five years now.) I wouldn't really recommend it. A crack or meth user who wanted someone to use with them would have plenty of nice things to say about those drugs too. "Well if you are feeling sad or lethargic, or need some inspiration, try this stuff.."
I don't think weed is the worst but it is a gateway and different strains produce different results. And if someone doesn't want to use it I don't think they should be pressured at all.