A sinus infection will have caused you nasal passage to be inflammed, although this may sound appealing as there would be more surface area to potentially absorb the drug, you willl most likely be unable to sniffso it won't work and is a bad idea and could worsen the infection.
I'm going to close this thread now before people flame you even more or suggest other ways to snort drugs with an infection of the sinuses.
If anyone has any problems with my closing of the thread or think that it should be reopened then shoot me a PM