I have been taking 30 mg percs of and on for a long time but never consecutively like I have been for the past month. I started taking them every weekend back in January of this year, 2011. Then about March or so I started taking them Monday thru Saturday (one 30 a day). Then April 10th I started taking one a day. For the past 2 weeks it has been 2 a day. I notice some symptoms but others I have I think are from a cold/bronchitis. I have not taken any since Sunday, May 22nd at around 7 p.m. I am taking a multi-vitamin now and some herbal vitamin to flush out my system (for the coughing). Is it possible to experience WDs from such a small time-frame of taking these?