Flakka is a synthetic amphetamine-like substance similar to the family of drugs known as cathinones, commonly referred to as bath salts. Just as bath salts are addictive, so is Flakka highly addictive both physically and psychologically, and can be smoked, inhaled, swallowed, or injected.hare. 14. 14. 0. Perhaps you’ve heard of bath salts or the meth epidemic. Now, a new synthetic drug has hit the market. Here, we review the drug Flakka and consequences of its use. We also explore why addicts use drugs in the first place, and invite your questions or comments at the end.