Smoking while sick will of course alleviate the immediate symptoms (cause you'll be blazed), and you'll feel better while high and maybe even that day. However, smoking while sick isn't ideal because it does suppress the immune system, meaning your body will take longer to finally get over your sickness. So, if you're feeling pretty shitty, I'd say just lay off blazing for a little bit and allow your immune system to get back to normal. Then just toss a chronic salad and steep some grean tea.