I've read quite a few post about chemicals being used for MMJ. Would someone kind enough explain to me what type they are and why there has to be any chemicals used at all? Are there strains that do not have any, does it cost extra?

Chemicals are the building blocks of life. Water is a chemical... as is copper. MMJ patients need to worry about inorganic chemical compounds in their medicine. The vast majority of chemical nutrients are NON-organic (inorganic), though more and more companies are going organic (even Miracle-Grow). You should only medicate with MMJ from a trusted source that uses organic chemicals. Inorganic medicine could contain heavy metals and other harmful chemicals that can stay in yuor body forever.

chemicals are good to use if they are organic and you have problems with your plant like a nutrient def.

I've had some herb a few times before that after smoking, I would itch like some pharmaceuticals prescripts have made me react. I'm wondering if that is a sign that the herb had inorganic chemical? Thanks for the help BTW.

Petro-trash fertilizer is often used to increase yield, that may have made you react.
Safe organic medical marijuana is the best!

You should avoid sewage sludge grown buds as well.

What is sewage sludge?

It's fertilizer from sewage.

Eww! Yeah, no doubt I'll avoid that if I can. How do you know though? By smell, or when you light up it poofs a little or ?

Buds that have a refreshing or smooth aroma are organic.
Quality dispensaries will not give you dangerous weed.

If your weed smells like toxic sewage, try burning a small sample; you can inhale or not.

Can you describe the itch you get from the herb you smoke?