ADVISORY: Outdoor furniture almost certainly uses treated wood. That is, toxic chemicals that act as fungicide, pesticide, and moisture-resister, which would be VERY BAD inhale the smoke of burning it.. And if it's pre-i-think-80s treated wood it's even worse than what they use now. You should also not use treated wood in bonfires and such.
Pipes are cheap, and even an apple (not ideal) is still better than this.
You could potentially get herpes from it, but idk how long the virus lives on porous material like wood exposed to the elements. Covid for instance lasts 4 days on wood, but only 1 on cardboard. It lives much longer on, say, plastic, than on clothing.
I'd be much more worried about toxic chemicals because outdoor furniture almost certainly uses treated wood. And if it's pre-i-think-80s treated wood it's even worse.
The hobbits loved pipe-weed, and they were experts in its cultivation and use. They had many different strains and blends, each with its own unique flavor and effect. They smoked it in bench holes, and they often added a pinch of herbs or spices to enhance the taste.
Some of pictures i see in Poland: dudes mixing tobacco, tea, and whatever they found in spice containers, smoked horribly dense smoke from that mixes using improvised shisha and then sitting and watching wall for hour; desperates using anything that could be rolled as cigarette paper; smoking fruit-flavoured chewing tobacco (that one was unexpectedly spectacular, 20 minutes later all 3 guys who did that turned into volcano models).
And this is just the tobacco, even before they started with stronger stuffs. Needless to say, Poland isn't Shire.