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Studies that investigate the effects of consuming substances other than e-cigarettes, such as drugs or tobacco

The number and intensity of effects noticed or felt varies from person to person, and even between each person's own cessation experiences

How long marijuana stays in your system depends on which type of drug test you're taking, how your body stores and releases fat, your frequency of use, and multiple other factors that influence how long THC remains detectable

Some studies have shown that e-cigarettes help people smoke fewer regular cigarettes, while others have demonstrated only modest gains over existing smoking cessation methods, like nicotine patches