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The doctors concluded that the ulcers were likely caused by chemical irritation and immune suppression linked to long-term vaping

PRCs engaged in both pro-smoking practices (e.g., accompanying recoverees outside to smoke) and pro-cessation practices (e.g., regularly asking recoverees about their cigarette smoking) (see Figure)

On an impulse, I took a photo of the box and posted it on Twitter, asking the same sort of question I posed at the start of this column: Do you remember these? I could not have been more surprised by the flood of responses

This is similar to the effect of contingency management on alcohol and other drug use