Hi i am a student .I have completed my BE but was always struggling with attention and motivation I tried mOdalert (Modafinil ) but it did t creat any difference,i cannot feel any thing different.I first started 50mg 16th sep (no effect) , 100 mg 17th sep (no effect),150 mg 18th sep 2014 (no effect) ,200mg 19th sep 2014 ( still no effect ) ,today 20th sep 2014 100mg with coffee (no effect) ,I take modalert early morning before breakfast orally. And i smoke cigrette 1 or 2 sticks maximum daily ,and sometime weed/marijuana also but not way too much please help and tell me what is wrong with me ,why can t i feel any concentration improvement ,stomach problems :(i dont hope but they are a sign that med is working , and all i need is concentration ,focus for studies?