just wash your hands heaps, and eat lots of fruit and veggies.
and dont go outside when the airs real cold
also dont smoke if ya choke, of coarse you will cough more then,

when my ex gave me Laryngitis (fuckin bitch i had it for 3 weeks), my throat was killing me!! but i still rolled a nice fat Joint and smoked it, it actually made me forget i had a sore throat because i got so stoned, your mind wonders off and you just dont care. so it cant be bad, also helps you sleep, and sleeeeep is good when your sick.