what is worse smoking cigarettes or weed marijuana may be more harmful to lungs than smoking cigarettes, study finds Inhaling Cannabis May Greatly Increase

The Test Results Were Contaminated or Inaccurate Just because you tested positive for marijuana does not mean that you are automatically guilty

Electronic Cigarettes. Available at: 8 The National Academies of Sciences, Engineering and Medicine

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Inability to Concentrate or a Foggy Mind The feeling that your concentration is not as good or that your mind now lives in a fog is experienced, to one degree or another, by almost two-thirds of recovering nicotine addicts

Friedman TC, et al