Switched meds and messed up dose before smoking marijuana and had grand mal, smoked before many times, never had this before not laced; still happens?

New symptoms: You may never have had problems before with the weed you're using, but each time you use, your brain is in a different situation, and that can cause you to seize. Furthermore, you state it wasn't laced, but unless you are growing your own ,I wouldn't be sure of that . Dealers are frequently adding substances to get you more hooked to their product, so you really can't be sure. Advice stop using!