This is from wikipedia so take it with a grain of salt, but you’d have to ingest over half a kilogram to get toxic and not lethal doses so as long as you smoke the tomato leaves in moderation, test away!

I would upgrade my brain to be able to consciously control all the little automatic stuff. Tell my brain to up the metabolic rate when I want to burn more fat, increase heart rate when exercising, basically to be able to consciously control all functions of my body at will.