Repeated and chronic heroin users who fail to use sterile needles or share equipment may experience infection of the heart lining and valves, normally due to lack of sterile technique.
Tiny pieces of leaf matter or even purposefully added adulterants added when hashish is produced can compromise the purity of hashish.
Inhalants are breathable chemical vapors are intentionally inhaled because of the chemicals' mind-altering effects.
Long-term methamphetamine abuse may result in inflammation of the heart lining.