Was thinking about smoking out my taillights. Is it legal in California and how much does it normally run to get done.

 

No, it is not legal in Cali.

However, you won't be pulled over just for that. If you do something stupid, they'll add that to the list of charges, depending on how "happy" the cop is.

You can DIY for about $25 with the right kit that you can find on the internet. It's a 15 minute job with a beer break. 20 minutes if you drink scotch...