Relative Strengths of Different Types of Opioids

Opioids are pain killers and can be found under numerous names, actual and street names. A few are created more naturally from the Opium poppy, some are part natural and some fully synthetic.

Opium
Codeine

Morphine

Semi synthetic opiates:

Heroin
Oxycodone (OxyContin, Percocet)
Hydrocodone
Hydromorphone

Fully synthetic:

Fentanyl

Methadone

Carfentanil

We’ll measure relative strengths of all of these from a base of one (1) for Morphine.

Opium is about 1/10 the strength of Morphine

Codeine is approximately 1/10 the strength of Morphine.
Tramadol is approximately 2/10ths the strength of Morphine.

Hydrocodone: about the same as Morphine

Oxycodone or Percocet: 1&1/2 - 2 times the strength of Morphine.

Hydromorphone: 5-7 times the strength of Morphine

Fentanyl: 50-100 times the strength of Morphine

Carfentanil: 10,000 times the strength of Morphine

Fentanyl particularly, and occasionally Carfentanil are often added to other drugs.
Marijuana for example can be made much more addictive by adding Fentanyl.
It also increases the intensity of the high.
And because one gets an increased tolerance, the user needs to constantly increase the dose. 

This is all wonderful for the dealer.
Remember that drugs are about the money, not your well being.

The opioid dealer isn’t going to tell you that you could become addicted for life in a very short time or that the drug may kill you.