quitting cigarettes while pregnant Myths about smoking during pregnancy. More information: https://smokefree.gov/quit-smoking/quitting-while-pregnant Vaping Deemed Safe During Pregnancy

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Commonly Laced Drugs and Substances Used Substances reported in laced or adulterated marijuana include PCP, synthetic cannabinoids, cocaine, methamphetamine, chemical solvents, and embalming-fluid mixtures

When someone smokes, the nicotine gets released, and it raises blood pressure and heart rate [4]

I dont see any reason why the self-addressed envelope route could not work in many instances but if you are trying to mail off illegal substances such as marijuana then it could obviously be very problematic (and illegal) so use common sense