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Description
Participants were divided equally into an intervention group and a control group

How to quit smoking: How I had reduced the number of cigarettes I smoke gradually

Cognitive Impairment: Long-term use of PCP includes lasting cognitive deficits, including memory loss and difficulties with attention and decision-making
A regular cigarette pack will usually have 20 cigarettes

doi: 10.1002/ppul.25705

Hence, the researchers could not compare the effects of smoking every other day, every few days, or weekly, for example