Although trying to quit , I still smoke and as a non-boater i always like to ask the boater if it is ok to smoke on boat.
If yes i try to be very concious of the smoke direction and making sure the ash goes over the side or - recently discovered- these little portable tin ashtrays about size of a sucrets can. That way ash and butts stay in pocket - rather than throw in lake or damaging boat etc .( yes guilty of that myself) . If boater says no then just bring some nicotine gum or spray or candies and that should help if it gets bad. But most of all- please respect the boaters wishes and respect his boat - and take the tips mentioned here and you will have a great day . I can attest to all of them- don't be afraid or intimitaded - talk to your partner - it will make for an awesome day and you will meet some fantastic people and learn alot along with having a great time. Most of it is common courtesy and respect.