Smoking is not the only cause of cancer. Western production is not necessarily the cause of temperature changes on Earth OR Mars.
Well, I might be a little bit guilt about the Mars thing. While I cut back from the three pack a day habit, I have been pointing my Laser level at Mars an awful lot lately. Just something I felt compelled to do while sitting on the porch, smoking and sipping 12 year old bourbon. John Carter hasn't been answering the Morse code messages though. Reckon he might be sleeping in some cave or sumpin.