Cottons: To filter out cutts, prevent clots, blood infections
Best: Sterifilt (a single-use filter) or new cotton for each new cooker for each new needle (each new shot)
OK: Q-Tip or tampon cotton
Risk: Long strands of cotton irritate veins; cause embolus
Meh: New cigarette butts
Risk: Cellulose, could inject fibers, trapped bacteria, viruses
Please Avoid: Old cottons
Risk: Likely full of bacteria, maybe viruses or even mold; could cause blood infection