question: Hello Dr: I have a funny feeling in my legs below my knee when i sit or lay down. I had blood test for sugar and vitamin B12 is good. Some times when i with my friends, They smoke a cigarettes and i get some puffs from them, When i do that in 10 second i get this bad sensation in my leg and i have hard time walking for a minute or 2. Please let me know whats wrong with me. Thank you so much.