Thou shalt not kill
Roman Catholic doctrine
Catholic teaching strictly prohibits euthanasia and suicide as violations of the commandment, "You shall not kill." Recognizing life and health as precious gifts from God, adherents are encouraged to avoid excess of food, tobacco, alcohol, and medications. Endangering others with excesses speed or drunkenness on the roadway incurs grave guilt. The use of drugs, except on strictly therapeutic grounds is a grave offense. Clandestine production and trafficking in drugs constitute "direct co-operation in evil."
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