Hi brsmit, I have several points of view on this specific subject, and hopefully they can help. First point, absolutely the answer is yes. Tar and chemicals/carcinogens from your barbers fingers can get into your scalp. Is that good for 5 week old grafts? Absolutely not. Do you have to switch your favorite barber? Not necessarily. Bring a bottle of Purell with you and explain your situation to your barber. See if he/she will use a generous amount before they touch your scalp. Easy answer?! Second point, my first hair transplant (as a newly graduated doctor) was in 2011 and my hair transplant technician was a heavy smoker. They even took a smoke break during the half way point. I justified the decision based on how good I knew that technician was. Would I make that same decision now?! Absolutely not, I’m a hair transplant surgeon and could never endorse that. Did my hair grow wonderfully with a great outcome. Yes! Third point, don’t smoke! Not even one puff. Don’t vape! You will throw all your results down the drain. 5 weeks is a critical phase for those new grafts to start growing. Make the comparison of a developing fetus in the womb. If the mother smokes, the baby will be born with low birth weight, irritability, and the pregnancy may not even make it to term as a result of the smoking. A little off topic, but I hope this comparison helps! Best of luck on your new hairs!