Researchers at Purdue are optimistic that the findings could help relieve opioid abuse.
A bill that would give counties the ability to set up needle exchanges without first getting state approval is one step closer to becoming law.
In the first two months of this year, there have been three confirmed fatal doses of such drugs.
Syringe exchange programs still face significant opposition from some officials, and funding the programs remains the largest barrier.
Clark County Health Officer Kevin Burke says the program has had a "slow but steady flow" of participants.
The department says it didn't advertise the opening of the program because it believed a soft opening was the best way to get the word out to those affected.
Monroe County won state approval in December 2015 to operate a needle exchange.
Overdose deaths have also increased with acute hepatitis cases.
State health department officials say reasons for that increase could include more testing, an increase in test accuracy and a rise in injection drug use.
Experts say developing evidence-based programs that address environmental factors is key to curbing teen drug use.