According to Frank frankdotlogullo@comcastperiodnet:

Besides UFL and LFL flash point is another part of the equation.
Methane's is far below zero and a cigarette or match would readily
ignite it.

Not quite. Flash point is the point at which a liquified gas can
produce enough vapor to flash when ignited with a flame. By
definition, methane in a home is well above flash - all flammable
gasses are above flash point when they're a gas. The issue
raised by the OP was the temperature of the ignition point.

Static electricity, like from walking over a nylon carpet
could ignite it. There is also autoignition temperature and it takes a
very hot surface to ignite methane.

The autoignition temperature of methane is 537C. Which theoretically
means that methane won't ignite unless it comes in contact with something
above 537C.

The tech's comment about the cigarette was downright stupid.

http://www.physlink.com/Education/AskExperts/ae1.cfm
http://www.nature.com/nature/journal.../247405a0.html
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.