Those are very close to funny but don't quite make it.
The first one may be me... it seems like there's a joke there but I don't get it. What's the joke? That the guy's already wearing a gas mask? That Spork farted? That the cat is a large gas deposit? Dont' get it!
The second one's a great set up, but you totally blew it in the third panel. What's up with the squirrel? Sure, it's random, but it's not funny-random, it's just kind of dumb random.
The comics -- except for the punchlines -- are very well written, however. If you can hone the humor part of it you'll be a good stripper. Try a few more.