A consumer must be cautious of medical quackery, which involves using unscientifically accepted methods. Quackery can have serious negative effects, including prolonging illness, wasting money, and giving false hope. Quacks often claim to have secret remedies and treat illnesses without proper training or licensing. They may deliberately deceive patients or genuinely believe in their ineffective treatments. Traditional medicine practitioners like albularios, who use medicinal plants, can effectively treat some illnesses, though herbal remedies require scientific validation.