Is it POSSIBLE something could happen? Sure. Is it LIKELY something could happen? No.
As to any criminal action, this seems all but completely impossible. For you to be charged with a crime related to this matter, there would need to be some intent on your part to cause injury or death. I would suggest that it would be all but impossible to demonstrate that you intended to harm anyone.
As to any civil action, this seems highly unlikely as well. If someone did sue, it would seem a much more prudent course of action to sue the company, not you. After all, the company surely has deeper pockets than you and any plaintiff would want the entity with the deeper pockets and better ability to pay.
And, of course, for either of these to be even a remote possibility, this person would need to suffer some injury. If there's never an injury, it isn't even worth discussing. Even then, you would still be protected by the written warning on the product.
Short answer, stop worrying so much, it's unlikely anything will ever come of this!
Also, several customers have asked how they may direct a question to me in particular. If you specifically want me to assist you in your legal matter, just start your question with "FOR JOSEPH" and I will gladly pick up the question as soon as I am on-line.