I've been on it for 4 weeks now at 150mg/day (1 pill), in the XL form. It has been a damned godsend. I was nearly suicidal a month ago, but within two weeks the majority of my depression was gone and the past two weeks I've been feeling more mentally healthy each day. I only noticed one day of side effects and that was the first day I took it, where I had the shakes so bad that it was like being a cellphone set on vibrate. That was it, though. Also, it reduced my cravings for cigs to the point where I quit. Although it's been just a week, I've only needed the odd occasional piece of Nicorette and it's nearly eliminated my anxiety that used to come from not having cigs around.

Everyone reacts differently though, so what I experienced isn't going to be everyone else's experience. Just my input, though