Possible Clues:

• Worried spies too ¿ they may be radioactive
• I like that poet's new elementary forms
• Elemental forms used in carbon dating
• Elemental variants
• They have the same atomic number (one), therefore, added to drinks
• Uranium 238 and strontium 90
• Poet is so freaked out with those with a chemical dependency
• Soot pies turn out to be different forms of the same chemical element
• Elementary variants to posies after arrangement