Contact-Form-7 jQuery - make fields disappear

Hello, I have in my site a Contact-Form-7 with many fields. There are radio buttons + Explanation. For example like this: <p style="background-color:#F1F1F1; font-weight:bold;">Do you smoke?(required)<br /> [radio DoYouSmoke "Yes" "No" "Rarely"] <br /> If yes, please say how much [textarea How-Much 40x2] </p> I want these fields to: -If the radio button is unchecked or selected NO, then the textaread should be hidden. -If somebody selects "yes" or "rarely" the textarea should appear. -it should work fine also on mobiles. I will not give access to the site. I will send you the site URL, the Contact-form-7 code. You will send me: -the jQuery to add. Where to add it. -The additional CSS code. -the new contact-form-7 -the explanation how to add new fields -the explanation how to make the other contact-form I have in the site work the same way (the site is bi-lingual, and has 2 contact forms)