THC vs nicotine: Both are dried leaves that are smoked for a drug effect — and both have tar that can harm the lungs. But they come from very different plants. The cannabinoids (eg, thc) in marijuana create the 'high'. These are quite psychoactive (mind altering) substances but not very addictive. In contrast, the nicotine in tobacco is only mildly psychoactive but very addictive.
Answered 4/23/2016
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