You might assume that those would be physical and psychological, but in fact all the really unpleasant symptoms that smokers experience when they quit are caused by a mental process, rather than the physical withdrawal from nicotine
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Jennifer Tidey, an associate dean of research at Brown University, has studied the behavioral science of cigarette smoking in vulnerable populations
Archived from the original on December 3, 2018
Reasons may include: Tolerance levels : Those who use marijuana regularly often develop a tolerance to its effects, including eye redness