I think it takes it a bit far TBH to insist that the grandparent has one cuddle a day, portions off part of the day to not smoke at all, has a shower, brushes teeth. Tooth brushing in particular doesn't even make sense because it's not your teeth which give off second hand smoke, it's your lungs.
Washing hands is extremely reasonable - I'd expect most people to wash hands before touching a newborn anyway, but doubly so when they have been doing something dirty.
Waiting for a period of time is also OK, changing clothes borderline for me, but if you're particularly concerned about the baby's face being close to material, then fair enough, especially for somebody staying for several days so likely to have several cuddles during those days.
And you absolutely should not demand anybody quit, or "try to persuade them" - no matter how strongly you feel. It's just rude and patronising IMO. They are an adult, they know the risks.
Like somebody else said, any baby born today will have FAR lower smoking exposure than babies born 30, 40, or 50 years ago. That's an achievement and it's worth keeping in perspective. Most babies will be fine even when they are exposed to a lot of cigarette smoke (of course a minority will be not, which is why it's a good thing that we are more aware of the risks today.) Babies will also come across all kinds of contaminants and you might as well start policing everything - did Grandma have a glass of wine and might have alcohol fumes on her breath? Are you going to put some kind of air filter contraption on the pram to avoid car exhaust fumes? To some extent you've got to relax and accept that risk factors exist but it's about doing what you reasonably can to reduce exposure, not about obsessively and aggressively eliminating every risk in the manner of a steamroller, to hell with what you damage in the pursuit.
Are people who are obsessively worried about cigarette smoke also aware of the issue of toxic flame retardants in furniture, carpets, blankets, prams and car seats? There was a poster who went around the boards mentioning this on every topic but most people don't even think about it. Do you think that nursery staff or midwives are all banned from smoking? They wash hands and remove outside clothing but don't usually take precautions apart from that.
DS2 never met one of his grandfathers as he died shortly before he was born, probably due to smoking. I am pretty sure we would take any risks from smoking if it meant DS2 could have a cuddle with his grandad, who would have loved him so very much.