drug is made from same version of stimulant used to produce bath salts .
flakka can be injected , snorted , smoked , or swallowed .
it causes euphoria , hallucinations , psychosis and superhuman strength .
high lasts for couple hours and users have strong desire to re-use .
more than 670 flakka occurrences in florida in 2014 , up from 85 in 2012 .