Smoking in Car Thread

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I've smoked in my car several times going to and from cigar events/herfs. Although I haven't made a regular habit of it, I've had zero problem with smell the next day as long as little to no ash falls and I've got the windows cracked.

I haven't smoked much while driving on the interstate though, mainly just around town. Do y'all smoke in the car differently while driving at higher speeds?