How do you cure ill effects of weed?

If you are experiencing flu like symptoms after using marijuana, there were most likely unwanted/ unnatural chemicals put in the marijuana to change its weight or increase the effects. Marijuana has been known to cause temporary respiratory problems when used in its natural state, the only way to end that is to take a break from smoking, marijuana should only be used in moderation anyway. To make sure your marijuana is clean try to find out who grew it, or grow it yourself. But always obey the law. If you disagree with the law, change it.