3month old help


Ok so I'm getting married next month. It's going to be a fairly bug reception cause his family is huge. Everyone wants to hold my 3 month old son. I'm onlybok with his mom my parents and my best friend who was there from birth for him. His family has a lot of smokers and I dont want them holding him if they have smoked...... they are now upset about that and are bombing him with messages. Am I being ti harsh or is this ok? I do not want my son getting sick cause someone kissed him or someone having a cold or something. I'm thinking if my sons needs and safty not his family needs...

Is that to overboard or does it seem reasonable.??