In a story on infusions for The Manual, Tyler Zielinski mentions CocktailSafe as a resource for checking safety first. 

For example, the pits of peaches, and other stone fruit, contain a compound called amygdalin which breaks down into hydrogen cyanide when ingested. If this ingredient were to find its way into a spirit, the consequences could be lethal. Refer to cocktailsafe.org before you go infusing away with various ingredients, and make sure to do your homework.

Check out the story here.