Instructables
Picture of Plastic Bottle Self Extinguishing Ashtray
Two wrongs make a sorta right--recycle a plastic bottle as a smoke-catching, self extinguishing ashtray.
 
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Step 1:

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Start with a 1 liter plastic bottle

Step 2:

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With your cutting tool of choice, cut the bottle slightly above the label all the way around.

Step 3:

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Your two pieces should look like this.

Step 4:

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Add about an inch of cat litter or sand to the bottom of the bottle.

Step 5:

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Turn the top part of the bottle upside down and fit it snugly into the bottom part.

Step 6:

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Using any wider household tape, add tape around the outer part of the bottle at the top leaving at least 1/2" extending over the top of the bottle. Fold this extended part of the tape over into the inside to enclose the seam.

Step 7:

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You can cut 1 or more V shapes into the top edge to hold burning cigarettes.

Step 8:

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Drop the burning cigarette butt through the bottle neck. (watch that you don't leave the burning part resting against the side of the bottle--it will melt a hole and ruin your creation).
The smoke is trapped in the bottle, and the reduced oxygen will extinguish the cigarette. I should mention that you shouldn't be either buying stuff in plastic bottles, or smoking. But just in case you do.