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This is counterpoint to the effect of nicotine, which has been shown to have immunosuppressive qualities

Nicotine Gum Nicotine gum is one of the oldest and most widely available chewing tobacco alternatives, delivering nicotine through a "chew and park" technique

Legal Status: Caffeine is legal and widely available, whereas tobacco products are subject to legal restrictions and regulations in many countries due to their harmful effects

Chen and Kandel (1995) monitored a cohort of adolescents and found that more than half of males and just under half of females were still smoking at ages 34 and 35, whereas 25.3 percent of males and 14.3 percent of females were using marijuana and 18.2 percent of males and 12.7 percent of females were using other illicit drugs at that same age