am I a bad mom

Is it bad that I'm a mom who smokes weed?? I have a 1 and a half year old. And I wouldn't classify myself as a stoner, but I indulge quite frequently. My son has never been exposed to any of the weed btw.. but the other day my sister offered me to go smoke with her and I was like ok sure. Then she sent me like a million paragraphs on how bad of a mother I am... like she basically set me up... I just feel like a bad mom. Can any others here relate at all??