When the office of National Drug Control Policy ran an ad with the headline,"Marijuana Harmless? Didn't see the merging truck.",it was using which type of ad appeal?

Name: When the office of National Drug Control Policy ran an ad with the headline,"Marijuana Harmless? Didn't see the merging truck.",it was using which type of ad appeal?
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The ad is using a fear appeal by suggesting that using marijuana can impair one's ability to drive and lead to fatal accidents.

When the Office of National Drug Control Policy Ran an Ad