Second hand smoke indeed.
Jensen (firstname.lastname@example.org) writes:
In Halo First Strike I noticed another posibility about Sgt. Johnson. Maybe the flood did not infect him because of the cigars he chews on, as it says in the book, " The Flood dosen't 'taste' anything," Cortana interjected. " The Infection forms rewrite a victim's cellular structure and convert him into a combat form-an incubator for more Infection forms. Based on what we've seen, they certainly don't just decide to pass the victim." The sergent shrugged. He fished into his pocket, found the remaining stub of a chewing cigar, and stuck it in the corner mouth.
so on and so forth.