Should i care or just leave it alone?

Seems like almost all of my friends smoke pot. I feel like...well kind of shocked cuz I feel like, "since when did everybody start rollin up?" but at the same time... I don't know. Almost all my friends are smoking it. Hell, everyone is nowadays but I'm never doing it. Smoking, orgies, drinking... it just isn't me. .____.' should I be upset by this change?