Feeling Uneasy About My Husband's New Job Habits

Alhamdulillah, my husband and I have been married for three years. He works in sales and recently started at a new company. He interacts with his team daily, which includes both men and women. I've noticed that he sometimes gets calls from female coworkers and waits to answer them until I'm not around, because he knows I prefer he avoid private conversations with other women. I found this out by checking his call log a couple times. We both avoid unnecessary interactions with the opposite gender, and he used to as well before this job. I'm a stay-at-home wife, and we've been trying to have a baby for years-it's been tough mentally, but Alhamdulillah. One challenge is that his sperm quality is very low. He uses nicotine vapes and, I later discovered, also uses marijuana vapes every night before bed. I was deeply hurt he didn't tell me about the marijuana before we married; I already dislike the nicotine, so this was even more upsetting. He mentioned he drank in college but stopped after graduating. Lately, with his new job, he has more work lunches, meetings, and even a work trip. When he calls me from the trip at night, his voice sounds strange-almost like he's fighting to speak clearly. We share locations, and I see he stays out very late at restaurants; for instance, he might say dinner with his team is at 6 PM but not return until 11 PM. That seems too late for a work dinner to me, and I feel it's unnecessary. If his colleagues want to stay out, that's fine, but I think my husband could excuse himself early to rest for the next day. I told him this, but he said in sales it's socially expected and he has to "play the game." I haven't asked if he's drinking, but my gut tells me something isn't right. I'm worried he might fall back into old habits, since he admits he has an addictive personality. I also fear he could make a poor choice with a female coworker if he's not in a good state. I'm scared for our marriage. Am I overthinking this? How should I talk to him when he gets back tomorrow night?