4 days before when I was walking (@8 pm) there was a van (which was releasing some gas to clean mosquito) that gas was taken by me because that van was very close to me and at the day after cough was started My question is whether that gas is the only reason for cough? Whether its a dangerous gas for human? Or else low temperature in the air may caused me cough I'm taking home made solutions for cough but its not recovered yet What should I do?