I gathered a set of state laws about indoor tanning regulation in the USA. I am doing nothing with them. If you wish to analyze the impact of indoor tanning regulations on tanning behaviors I can dump the effective dates (month-year) in a pastebin for you.
Data on tanning behaviors is available in the YRBSS (you can contact them to obtain state IDs), NHIS (state IDs restricted access only), and potentially in consumer panels where tanning related products may be identified.