To solve this problem, we need to identify which part of the poppy plant is used to obtain the drug 'Smack'.$\newline$Let's analyze the options:$\newline \bullet$Option 1: Roots - The roots of the poppy plant are not used to produce 'Smack'.$\newline \bullet$Option 2: Latex - The latex of the poppy plant, also known as opium, is the source of several narcotic drugs, including 'Smack'.$\newline \bullet$Option 3: Flowers - While the flowers are part of the poppy plant, they are not used to produce 'Smack'.$\newline \bullet$Option 4: Leaves - The leaves of the poppy plant are not used to produce 'Smack'.$\newline$The correct answer is Option 2: Latex, as it is the part of the poppy plant used to obtain the drug 'Smack'.