Studies indicate that non-injection methamphetamine use among heterosexual men and women is associated with unprotected vaginal sex and a higher amount of sex partners during the past 12 months.
One person may have a "bad trip" on a low dose of LSD, while someone else who uses the drug often can take a high dose and get through it without distress.
The level of familial interaction may influence children of alcoholics risk for alcohol abuse.
Valium may increase some individual's propensity toward self-harm and may even provoke suicidal tendencies or acts.