I used to smoke weed everyday, all day. Then one day, I would smoke and my heart would just start beating really fast. I would be fine one second then my heart would feel like it was doing overtime. It s not panic attacks because I m not shaking or trembling, I m perfectly calm, but my heart feels like it s going to explode. I ve seen other people have had the exact same problem as me but they don t know how to fix it either. Help!