My bf has been smoking pot regularly for 10 yrs now. I used to smoke when he just started (we were on HS) but stopped the year after I graduated. In the last 4 years, I've never once felt compelled to light a blunt from being in his company (so that statement about "and you will too") is incorrect. Also, if he was going to need something "stronger" he would have needed it by now.
Thing is, there are actual pot conniseurs out there, my bf being 1 of them. They have huge respect for the herb, don't believe in abusing it, or using it to self-medicate and some can even explain different brand genomes to you

Yes, my bf can show you which colour is what and grade its quality. From what I've seen its akin to drinking a fine wine.... They are well versed in the herb and won't tolerate smoking shyt either, just like a wine conniseur won't be caught dead drinking boxed wine and spit it out if you gave it to him
So what I'm saying is, my bf appreciates pot, he enjoys smoking it, and I've NEVER seen him high. He says he feels relaxed or buzzed, but you really can't tell the difference because getting high is not his goal.
Also would like to add that I prefer my smoking bf to a drinking bf. Thank goodness he stopped drinking, and he wasn't even a horrid drunk, maybe its just because "drunk bf" is obviously drunk and also I've been witness to so many alcohol - related tragedy... And then you see "high bf" and well he's still just bf. lol
That being said, only you can ascertain if your new bf is a pothead looking for a great high, (which I seriously doubt if he's been smoking for so long and still hasn't dabbled in hard drugs) or if he's someone who simply enjoys pot. And only you can decide if you are ok and accepting of your discovery.