It was true; she’d come back from rehearsal later and later each night, looking terrible; she’d yawn and stumble straight into bed. So she probably wouldn’t be home for a couple of hours at the earliest. I decided to risk it.

I took the jar of weed from its hiding place and started rolling a joint.

I’d been smoking marijuana since university. I first encountered it during my first term, alone and friendless at a fresher party, too paralyzed with fear to initiate a conversation with any of the good-looking and confident young people around me. I was planning my escape when the girl standing next to me offered me something. I thought it was a cigarette until I smelled the spicy, pungent, curling black smoke. Too shy to refuse, I accepted it and brought the joint to my lips. It was badly rolled and coming unstuck, unraveling at the end. The tip was wet and stained red from her lipstick. It tasted different from a cigarette; it was richer, rawer, more exotic. I swallowed down the thick smoke and tried not to cough. Initially all I felt was a little light on my feet. Like sex, clearly more fuss was made over marijuana than it merited. Then—a minute or so later—something happened. Something incredible. It was like being drenched in an enormous wave of well-being. I felt safe, relaxed, totally at ease, silly and unself-conscious.

That was it. Before long I was smoking weed every day. It became my best friend, my inspiration, my solace. An endless ritual of rolling, licking, lighting. I would get stoned just from the rustling of rolling papers and the anticipation of the warm, intoxicating high.

All kinds of theories have been put forward about the origins of addiction. It could be genetic; it could be chemical; it could be psychological. But marijuana was doing something much more than soothing me: crucially, it altered the way I experienced my emotions; it cradled me and held me safe like a well-loved child.

In other words, it contained me.

The psychoanalyst W. R. Bion came up with the term containment to describe a mother’s ability to manage her baby’s pain. Remember, babyhood is not a time of bliss; it’s one of terror. As babies we are trapped in a strange, alien world, unable to see properly, constantly surprised at our bodies, alarmed by hunger and wind and bowel movements, overwhelmed by our feelings. We are quite literally under attack. We need our mother to soothe our distress and make sense of our experience. As she does so, we slowly learn how to manage our physical and emotional states on our own. But our ability to contain ourselves directly depends on our mother’s ability to contain us—if she had never experienced containment by her own mother, how could she teach us what she did not know? Someone who has never learned to contain himself is plagued by anxious feelings for the rest of his life, feelings that Bion aptly titled nameless dread. Such a person endlessly seeks this unquenchable containment from external sources—he needs a drink or a joint to “take the edge off” this endless anxiety. Hence my addiction to marijuana.

I talked a lot about marijuana in therapy. I wrestled with the idea of giving it up and wondered why the prospect scared me so much. Ruth said that enforcement and constraint never produced anything good, and that, rather than force myself to live without weed, a better starting place might be to acknowledge that I was now dependent on it, and unwilling or unable to abandon it. Whatever marijuana did for me was still working, Ruth argued—until the day it would outlive its usefulness, when I would probably relinquish it with ease.

Ruth was right. When I met Kathy and fell in love, marijuana faded into the background. I was naturally high on love, with no need to artificially induce a good mood. It helped that Kathy didn’t smoke it. Stoners, in her opinion, were weak willed and lazy and lived in slow motion—you pricked them and six days later they’d say, “Ouch.” I stopped smoking weed the day Kathy moved into my flat. And—as Ruth had predicted—once I was secure and happy, the habit fell away from me quite naturally, like dry caked mud from a boot.

I might never have smoked it again if we hadn’t gone to a leaving party for Kathy’s friend Nicole, who was moving to New York. Kathy was monopolized by all her actor friends, and I found myself alone. A short, stubby man, wearing a pair of neon-pink glasses, nudged me and said, “Want some?” I was about to refuse the joint between his fingers, when something stopped me. I’m not sure what. A momentary whim? Or an unconscious attack on Kathy for forcing me to come to this horrible party and then abandoning me? I looked around, and she was nowhere to be seen. Fuck it, I thought. I brought the joint to my lips and inhaled.

Just like that, I was back where I had started, as if there had been no break. My addiction had been patiently waiting for me all this time, like a faithful dog. I didn’t tell Kathy what I had done, and I put it out of my mind. In fact I was waiting for an opportunity, and six weeks later, it presented itself. Kathy went to New York for a week, to visit Nicole. Without Kathy’s influence, lonely and bored, I gave in to temptation. I didn’t have a dealer anymore, so I did what I had done as a student—and made my way to Camden Town market.

As I left the station, I could smell marijuana in the air, mingled with the scent of incense and food stalls frying onions. I walked over to the bridge by Camden Lock. I stood there awkwardly, pushed and nudged by an endless stream of tourists and teenagers trudging back and forth across the bridge.

I scanned the crowd. There was no sign of any of the dealers who used to line the bridge, calling out to you as you passed. I spotted a couple of police officers, unmissable in their bright yellow jackets, patrolling the crowd. They walked away from the bridge, toward the station. Then I heard a low voice by my side: “Want some green, mate?”