Another concern would be cannabis, since it is legal for medical or recreational use in 39 states now.
I am only an occasional user, but I make an effort to keep it packed away deep in the van.
I also don't cross state lines with it, and do not drive under the influence.
It's also important to recognize that cannabis is still schedule 1 under federal law.
So really don't go into federally controlled places like government facilities. And avoid schools and such that have 'drug free zone' postings.
I'd also avoid having papers or lighters anywhere near the drivers area.
When I was on tour in a band years ago, we had a flat tire in the midwest someplace.
Police stopped to ask if we needed help.
All 4 of us had the tire change handled fine so we waved them on.
LEO spotted rolling papers and a lighter on the dash and asked if they were for drugs.
I explained they were for rolling tobacco. We had a can of Drum tobacco that we shared among the band members.
Filthy habit. Glad I quit.
Cop wasn't hearing it. Had us pull everything out of the van. Searched all our guitar cases, luggage and INSIDE the speaker cabinets.
Did I mention it was raining?
So yeah, keep that stuff out of sight. Even if you are just a tobacco addict. Probable cause has a lot of latitude.