i work in an airport, and here is the answer...
lighters: you can take them ON YOUR PERSON, i.e. in your trousers pocket - it won;t do in a handluggage bag and definietly not in a hold bag - reason being if it's in your pocket there is no danger of you not noticing if it accidently ignites. was an incident once where i think a bag in hold caught fire due to a lighter
deodorants: doesnt matter which bag u put it in
hope this helps