if you smoke when your sick just make sure and drink a lot of fluids, ive been sick with one of the worst colds in my entire life this whole week and the first night i had it i smoked, felt great and passed out without drinking anything and when i woke up i felt like i was ganna die, my throat and mouth were dryer than they have ever been and my chest hurt when i took deep breathes and i had the worst headache... tried it again a few nights later but this time took down like 3 bottles of all sport and felt great...still felt sick when i woke up but it helped me get a good nights rest and aleviated the symptoms better than any over the counter cold medicine could ever have